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<SEC-DOCUMENT>0001171520-04-000232.txt : 20040625
<SEC-HEADER>0001171520-04-000232.hdr.sgml : 20040625
<ACCEPTANCE-DATETIME>20040625155846
ACCESSION NUMBER:		0001171520-04-000232
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		8
FILED AS OF DATE:		20040625

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FRANKLIN STREET PROPERTIES CORP /MA/
		CENTRAL INDEX KEY:			0001031316
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				042724223
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-79072
		FILM NUMBER:		04882247

	BUSINESS ADDRESS:	
		STREET 1:		401 EDGEWATER PL
		STREET 2:		STE 200
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880
		BUSINESS PHONE:		7815571300

	MAIL ADDRESS:	
		STREET 1:		401 EDGEWATER PLACE
		STREET 2:		STE 200
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FRANKLIN STREET PARTNERS LP
		DATE OF NAME CHANGE:	20010301

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MCGILLICUDDY DENNIS J
		CENTRAL INDEX KEY:			0001240925

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		401 EDGEWATER PLACE
		STREET 2:		STE 200
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880
		BUSINESS PHONE:		7815571300

	MAIL ADDRESS:	
		STREET 1:		401 EDGEWATER PLACE
		STREET 2:		STE 200
		CITY:			WAKEFIELD
		STATE:			MA
		ZIP:			01880
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>eps1424.txt
<DESCRIPTION>DENNIS J. MCGILLICUDDY
<TEXT>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                        Franklin Street Properties Corp.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                    Common Stock, par value $.0001 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    35471F102
                                 --------------
                                 (CUSIP Number)

                               Dennis McGillicuddy
                          5111 Ocean Boulevard, Suite C
                               Sarasota, FL 34242
                                 (941) 349-9200
- --------------------------------------------------------------------------------
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)

                                  June 1, 2003
             -------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box |X|.

NOTE: Schedules filed in paper format should include a signed original and five
copies of the schedule, including all exhibits. Seess. 240.13d-7(b) for other
parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover shall not be deemed to
be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934
("Act") or otherwise subject to the liabilities of that section of the Act but
shall be subject to all other provisions of the Act (however, see the Notes).
<PAGE>

- -----------------------------------
CUSIP No. 35471F102                   13D
- -----------------------------------

- --------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

      Dennis J. McGillicuddy
- --------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a)|_|
                                                                          (b)|X|

- --------------------------------------------------------------------------------
  3   SEC USE ONLY


- --------------------------------------------------------------------------------
  4   SOURCE OF FUNDS (See Instructions)

      OO
- --------------------------------------------------------------------------------
  5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) OR 2(e)                                                           |_|

- --------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      USA
- --------------------------------------------------------------------------------
              7   SOLE VOTING POWER

                  404,499
 NUMBER OF    ------------------------------------------------------------------
   SHARES     8   SHARED VOTING POWER
BENEFICIALLY
  OWNED BY        15,770.54
    EACH      ------------------------------------------------------------------
 REPORTING    9   SOLE DISPOSITIVE POWER
   PERSON
    WITH          404,499
              ------------------------------------------------------------------
              10  SHARED DISPOSITIVE POWER

                  3,189,163.58
- --------------------------------------------------------------------------------
  11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      3,593,662.58
- --------------------------------------------------------------------------------
  12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES      |_|
      (See Instructions)

- --------------------------------------------------------------------------------
  13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      7.2%
- --------------------------------------------------------------------------------
  14  TYPE OF REPORTING PERSON (See Instructions)

      IN
- --------------------------------------------------------------------------------
<PAGE>

                                  SCHEDULE 13D

      This Schedule 13D amends the Schedule 13G filed on June 11, 2003. Based on
the advice of current counsel, Dennis McGillicuddy is filing this Schedule 13D
to amend and supplement the information as to the transactions previously
reported on a Schedule 13G.

Item 1. Security and Issuer.

      This statement on Schedule 13D (this "Statement") relates to the common
stock, par value $.0001 per share (the "Common Stock"), of Franklin Street
Properties Corp., a Maryland corporation ("FSP Corp."). The principal executive
offices of FSP Corp. are located at 401 Edgewater Place, Suite 200, Wakefield,
MA 01880-6210.

Item 2. Identity and Background.

      Dennis J. McGillicuddy is a member of the Board of Directors of FSP Corp.
Mr. McGillicuddy invests for his own account. The business address of Mr.
McGillicuddy, who is a United States citizen, is 5111 Ocean Boulevard, Suite C,
Sarasota, FL 34242.

      During the past five years, Mr. McGilliciddy has not been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors).
During the past five years, Mr. McGillicuddy was not a party to a civil
proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such proceeding was or is subject to a judgment, decree or final
order enjoining future violations of, or prohibiting or mandating activities
subject to, federal or state securities laws or finding any violation with
respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration.

      No funds were borrowed by Mr. McGillicuddy or any related entity for the
acquisition of FSP Common Stock.

      On June 1, 2003, FSP Corp. completed its acquisition of thirteen real
estate investment trusts (collectively, the "Target REITs"), each a Delaware
corporation. The acquisitions were completed pursuant to an Agreement and Plan
of Merger, dated as of January 14, 2003 (the "Merger Agreement"), by and among
FSP Corp. and the Target REITs.

      Upon consummation of the transactions contemplated by the Merger
Agreement, each Target REIT was merged with and into FSP Corp., with FSP Corp.
as the surviving corporation (the "Mergers"). Under the terms of the Merger
Agreement each outstanding share of preferred stock, $0.01 par value per share
("Target Stock"), of each respective Target REIT, as of June 1, 2003, was
converted into a specified number of shares of Common Stock. Under the terms of
the Merger Agreement each outstanding share of common stock, $0.01 par value per
share, of each respective Target REIT, as of June 1, 2003, was cancelled.

<PAGE>

      In connection with the Mergers, FSP Corp. reserved for issuance an
aggregate of approximately 25,000,091 shares of Common Stock. Based on the
capitalization of FSP Corp. as of the effective date of the Mergers, the Common
Stock reserved for issuance to the Target REIT stockholders represented
approximately 50.3% of the outstanding shares of FSP Common Stock.

      Mr. McGillicuddy indirectly owned an aggregate of 229 shares of Target
Stock prior to the Mergers. Pursuant to the Merger Agreement, such shares of
Target Stock converted into 1,586,343.29 shares of FSP Common Stock upon
consummation of the Mergers. Mr. McGillicuddy was not an officer or director of
any Target REIT.

      Mr. McGillicuddy's ownership of Common Stock is as follows:

      o     McGillicuddy Investments Limited Partnership III, of which Mr.
            McGillicuddy is a limited partner, owned 229 shares of Target Stock
            prior to the Mergers. Pursuant to the Merger Agreement, such shares
            of Target Stock converted into 1,586,343.29 shares of Common Stock.
            McGillicuddy Investments Limited Partnership III also owned
            576,880.75 shares of Common Stock prior to the Mergers. McGillicuddy
            Investments Limited Partnership III currently owns 2,163,224.04
            shares of Common Stock.

      o     McGillicuddy Family Limited Partnership, of which Mr. McGillicuddy
            is general partner, owns 404,499 shares of Common Stock.

      o     Mr. McGillicuddy's spouse owned 1 share of Target Stock prior to the
            Mergers. This share was purchased with $100,000 in personal funds.
            Pursuant to the Merger Agreement, such share of Target Stock was
            converted into 6,824.54 shares of Common Stock. In addition, Mrs.
            McGillicuddy is the sole trustee of several trusts for Mr.
            McGillicuddy's grandchildren, which trusts, in the aggregate, hold
            8,946 shares of Common Stock.

      o     Pursuant to the Indenture of Trust Agreement by and between Barry
            Silverstein, as Grantor, and Trudy Silverstein and Dennis
            McGillicuddy, as Trustees, dated September 22, 2003, and the
            Indenture of Trust Agreements by and between Barry Silverstein, as
            Grantor, and Mark Shale Silverstein and Dennis McGillicuddy, as
            Trustees, dated September 22, 2003, Mr. McGillicuddy is a trustee of
            four charitable lead annuity trusts for the benefit of Mr.
            Silverstein's children. The trusts own, in the aggregate, 100% of
            the limited partnership interests of Silverstein Investments Limited
            Partnership II, which owns 1,010,169 shares of Common Stock. Mr.
            McGillicuddy, as trustee, has shared dispositive power and no voting
            power of the shares of Common Stock held by Silverstein Investments
            Limited Partnership II.

      All descriptions of agreements filed as exhibits to this Schedule 13D are
modified by the actual terms of such agreements.
<PAGE>

Item 4. Purpose of Transaction.

      See Item 3 above. Mr. McGillicuddy has no present plans or proposals which
relate to or would result in any of the actions enumerated in clauses (a)
through (j) of Item 4 of Schedule 13D.

Item 5. Interest in Securities of the Issuer.

      (a) The percentages set forth in this Item 5 are based on 49,630,338
shares of Common Stock outstanding.

      Mr. McGillicuddy beneficially owns 3,593,662.58 shares of Common Stock
representing approximately 7.2% of the outstanding Common Stock.

      (b) Mr. McGillicuddy has sole voting power and sole dispositive power with
respect to 404,499 shares of FSP Common Stock.

      Mr. McGillicuddy may have shared voting and shared dispositive power with
respect to 15,770.54 shares of FSP Common Stock beneficially owned by his wife.
8,946 of these shares are held by trusts, of which Mr. McGillicuddy's wife is
the sole trustee, for the benefit of Mr. McGillicuddy's grandchildren.

      Mr. McGillicuddy has shared dispositive power with respect to 3,173,393.04
shares of FSP Common Stock. 1,010,169 of these shares are attributable to four
trusts through their ownership of the limited partnership interests of
Silverstein Investments Limited Partnership II. Mr. McGillicuddy is a trustee of
these trusts, which are for the benefit of Mr. Silverstein's children.

      (c) Except as described in this Schedule 13D, there have been no
transactions since June 11, 2003.

      (d) Various persons have the right to receive or the power to direct the
receipt of dividends from, or proceeds from the sale of, shares of Common Stock
beneficially owned by Mr. McGillicuddy. No such person has the right to receive
or the power to direct the receipt of dividends from, or proceeds from the sale
of, shares of Common Stock beneficially owned by Mr. McGillicuddy in excess of
5% of the outstanding shares of Common Stock.

      (e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships
        With Respect to Securities of the Issuer.

      Except as discussed in Item 3 above, Mr. McGillicuddy is not a party to
any contract, arrangement, understanding or relationship with respect to any
securities of the Issuer and none of the securities as to which this Statement
relates is pledged or is otherwise subject to a contingency the occurrence of
which would give another person voting power or investment power over such
securities.
<PAGE>

      Although Barry Silverstein, also a director of FSP Corp., and Mr.
McGillicuddy have had various long-term business relationships with each other,
there is no understanding or agreement between Messrs. Silverstein and
McGillicuddy as to voting or disposition of the Common Stock. Mr. McGillicuddy
disclaims the existence of a Section 13 group between himself and Mr.
Silverstein.

Item 7. Material to be Filed as Exhibits.

      Exhibit 1     Agreement and Plan of Merger among Franklin Street
                    Properties Corp. and thirteen real estate investment trusts,
                    dated as of January 14, 2003, which is incorporated herein
                    by reference to Exhibit 2.1 of Franklin Street Properties
                    Corp.'s Report on Form 8-K filed on January 15, 2003

      Exhibit 2     Limited Partnership Agreement of McGillicuddy Investments
                    Limited Partnership, III, dated September 27, 2000

      Exhibit 3     Limited Partnership Agreement of the McGillicuddy Family
                    Limited Partnership, dated December 18, 2001

      Exhibit 4     Limited Partnership Agreement of Silverstein Investments
                    Limited Partnership, II, dated November 22, 1999, as amended
                    on September 16, 2003 and June 24, 2004

      Exhibit 5     Indenture of Trust for the JM Silverstein 2003 CLAT by and
                    between Barry Silverstein, Trudy Silverstein and Dennis
                    McGillicuddy, dated September 22, 2003

      Exhibit 6     Indenture of Trust for the Mark S. Silverstein 2003 CLAT
                    by and between Barry Silverstein, Mark Shale Silverstein and
                    Dennis McGillicuddy, dated September 22, 2003

      Exhibit 7     Indenture of Trust for the Susan S. Potter 2003 CLAT by
                    and between Barry Silverstein, Mark Shale Silverstein and
                    Dennis McGillicuddy, dated September 22, 2003

      Exhibit 8     Indenture of Trust for the Thomas Benjamin Silverstein
                    2003 CLAT by and between Barry Silverstein, Mark Shale
                    Silverstein and Dennis McGillicuddy, dated September 22,
                    2003
<PAGE>

                                   SIGNATURES

      After reasonable inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.

Dated: June 24, 2004


                                By: /s/ Dennis J. McGillicuddy
                                    --------------------------
                                    Dennis J. McGillicuddy



</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-2
<SEQUENCE>2
<FILENAME>ex-2.txt
<TEXT>

                                                                       Exhibit 2


                          LIMITED PARTNERSHIP AGREEMENT
                                       OF
                McGillicuddy Investments Limited Partnership, III
                         a Delaware limited partnership
<PAGE>

                                    TABLE OF CONTENTS

                                                                        Page No.

ARTICLE I

                             FORM AND INTERPRETATION

Definitions                                                                   5
Captions and Certain Terms                                                    9
Severability                                                                  9
Limitation of Grant                                                           9

ARTICLE II

                           ORGANIZATION OF PARTNERSHIP

Formation, Name, Office and Registered Agent                                  9
Purpose of Partnership                                                       10
Term of Partnership                                                          11
Authorized Acts                                                              11
Co-Ownership of Partnership Interests                                        12
Representations and Warranties of the Limited Partners                       12

ARTICLE III

                               PARTNERSHIP CAPITAL

Capital Contributions                                                        14
Capital Account                                                              15
Expenses Paid by Partners                                                    16
Loans by Partners; Restrictions on Borrowing                                 16

ARTICLE IV

             PROFITS AND LOSSES AND TAXABLE INCOME AND TAXABLE LOSS

Allocations                                                                  16

ARTICLE V

                       DISTRIBUTIONS, WITHDRAWLS AND LOANS

Distributions                                                                18
Limitation on Distributions to Partners                                      20

ARTICLE VI

                 AUTHORITY, DUTIES, AND LIABILITIES OF PARTNERS

Duties of Managing General Partner                                           20
Managing General Partner's Fees and Expenses                                 20


                                        2
<PAGE>

Authority of Managing General Partner                                        21
Special Limitation                                                           22
Dealing with Affiliates                                                      23
Indemnification of Managing General Partner                                  23
Liability of Limited Partners                                                23
Authority of Limited Partners and Non-Managing General Partners              23

ARTICLE VII

                        TRANSFER OF PARTNERSHIP INTERESTS

Limited Partners                                                             24
Managing General Partner                                                     24
Restriction on Transfer                                                      24
Admission of Substitute Partner                                              25
Rights of Partner After Assignment and Substitution                          25
Allocations and Distributions After Assignment                               25

ARTICLE VIII

                  RETIREMENT, WITHDRAWL OR REMOVAL OF PARTNERS

Withdrawal of Managing General Partner or Limited Partner                    26
Retirement, Removal, or Withdrawal of Managing General Partner               27
Retirement of Limited Partner                                                27
Rights of Partner After Retirement, Removal, or Withdrawal                   27

ARTICLE IX

                                   DISSOLUTION

Events of Dissolution                                                        28
Winding Up and Distributions                                                 28
Distribution of Liquidation Proceeds and Assets and Allocation
    of Gains and Losses                                                      29
Limitation of Liability of Partners                                          29
Waiver of Right of Partition of Assets                                       29

ARTICLE X

                  ACCOUNTING YEAR, BOOKS, RECORDS, AND REPORTS

Books and Records                                                            29
Reports                                                                      30
Bank Accounts                                                                30
Tax Elections                                                                30
Accounting Method and Fiscal Year                                            30


                                        3
<PAGE>

ARTICLE XI

                               GENERAL PROVISIONS

Power of Attorney                                                            31
Partnership Contracts                                                        31
Conveyances                                                                  31
Notices                                                                      32
Consents                                                                     32
Meetings                                                                     32
Binding Effect; Counterparts                                                 33
Choice of Law                                                                33
Complete Agreement; Modification                                             33
Evidence of Partnership Interests                                            33
Tax Matters Partner                                                          34
Gender and Number                                                            34


                                        4
<PAGE>

           McGILLICUDDY INVESTMENTS LIMITED PARTNERSHIP III AGREEMENT

      This Limited Partnership Agreement ("Agreement") is entered into, pursuant
to the provisions of the Delaware Uniform Limited Partnership Act, and shall be
retroactively effective as of the date of filing of the Certificate of Limited
Partnership with the Delaware Secretary of State, by Dennis J. McGillicuddy,
Jr., a resident of Massachusetts whose address is One Snapper Lane, Falmouth, MA
02540 (as the "Managing General Partner"). Dennis J. McGillicuddy and Graciela
S. McGillicuddy, both residents of Florida, whose address is 5111 Ocean
Boulevard, Suite C, Sarasota, Florida 33581, are the only limited partner in the
Partnership. This Agreement is on the following terms and conditions:

                                    ARTICLE I

                             FORM AND INTERPRETATION

      1. Definitions. The following capitalized terms, as used in this Agreement
and in the attached exhibits, which constitute a part of this Agreement, have
the meanings ascribed to them below and include the plural as well as the
singular number:

      "Act" means the Delaware law pertaining to Limited Partnerships, as
amended, or any subsequent Delaware law concerning partnerships that are enacted
in substitution for the Act.

      "Affiliate" of a Partner means (1) another Partner of the Partnership; (2)
a legal or personal representative of any Partner; (3) the Partner's lineal
descendants and spouse (other than a spouse who is legally separated from the
Partner under a decree of divorce or separate maintenance); (4) a trustee of a
trust for the benefit of any Person referred to in clause (1), (2) or (3); (5) a
Person, other than an individual, of which 80% or more of the voting or equity
interests is owned directly or indirectly by a Partner and/or one or more of the
Persons referred to in clauses (1) through (4); (6) a Person owning 80% or more
of the voting or equity interests of a Partner that is not an individual; or (7)
a Person other than an individual, 80% or more of the voting or equity interests
of which is owned by the same Person that owns 80% or more of the voting or
equity interests of a Partner that is not an individual.

         "Agreement" means this Limited Partnership Agreement as originally
executed and as subsequently amended or supplemented from time to time in
accordance with section 54.

      "Assignment" means a sale, exchange, gift, pledge, transfer or disposition
of any kind whatsoever and, in the case of a Person that is not an individual,
it includes the sale, exchange, pledge, transfer or disposition of a majority of
either voting control or the equity interests in such Person.


                                        5
<PAGE>

      "Bankruptcy" means taking advantage of any bankruptcy or insolvency act
(including the Bankruptcy Reform Act of 1978 or similar law, and also any
proceeding under state or local insolvency or debtor relief laws), or a final
adjudication of insolvency or an assignment of a major portion of a Person's
assets for the benefit of creditors.

      "Capital Account" has the meaning set forth in section 12.

      "Capita1 Contribution" means the total amount of cash, and net fair market
value of securities and other property contributed by a Partner to the equity of
the Partnership, or agreed to be contributed by a Partner to the equity of the
Partnership, pursuant to section 11(a), and reduced by any return of capital to
the Partner within the meaning of section 11(c). Any reference in this Agreement
to the Capital Contribution of either a Partner or an assignee of a Partner
shall include the Capital Contribution of any prior Partner to whose Partnership
Interest the then existing Partner or assignee succeeded.

      "Cash Flow" means the excess of cash derived by the Partnership from all
sources, including from capital contributions, loans, sales of securities and
other activities, (but excluding cash derived from the winding-up and
liquidation of the Partnership pursuant to section 37) over the sum of all cash
disbursements, including repayments of loans from Partners, loans to Partners
for the Partnership, and distributions to Partners pursuant to section 16(a) or
(b) (but excluding disbursements pursuant to section 16(c), plus a reasonable
allowance for reserves for repairs, investments in Property (including
Marketable Securities), replacements, contingencies and anticipated obligations
(including debt service, capital improvements and replacements to the extent not
funded by reserves) as reasonably determined by the Managing General Partner.
Notwithstanding the preceding sentence, in determining the reasonable allowance
for reserves, the Managing General Partner shall reduce such allowance to the
extent necessary to ensure that annual distributions of Cash Flow to each
Partner will be in an amount at least equal to the annual income tax liability
(exclusive of income tax liability resulting from a transaction pursuant to
section 16(b) or (c)) of each such Partner (determined assuming that the maximum
possible income tax rate is applicable) resulting from the allocation to the
Partner of his share of the Partnership's Taxable Income and Taxable Loss. Cash
Flow is to be calculated separately for each Partner on the theory that each
Partner owns the assets of the Partnership contributed by such Person directly.
For this purpose, if a Partner has contributed Marketable Securities to the
Partnership, such Marketable Securities (including stock dividends thereon,
stock splits or other recapitalization) shall be allocated to the contributing
Partner (or such Partner's assigns). In addition, Cash Flow shall be calculated
and distributed separately for each of the Class A Partnership Interest and the
Class B Partnership Interest and the assets of the Partnership allocated to such
interests.

      "Class A Partnership Interest" means an interest in the Partnership
represented by the Capital Account associated only with the Partnership's
ownership of those assets listed on Exhibit A-1 attached hereto and made a part
hereof (the "Class A Properties"), and the right to receive a percentage share
of the income, gain, loss, deduction, cash and


                                        6
<PAGE>

other distributions and liquidation proceeds associated with such property, all
subject to and interpreted in accordance with the terms of this Agreement. A
Class A Partnership Interest may be expressed in units with each unit
representing ownership of a one percent interest in the Class A Properties.

      "Class B Partnership Interest" means an interest in the Partnership
represented by a partner's Capital Account relating to all assets of the
Partnership other than those assets listed on Exhibit A-1 attached hereto and
made apart hereof, (i.e., excluding the Capital Account relating to the Class A
Properties), and the right to receive his percentage share of the income, gain,
loss, deduction, cash and other distributions and liquidation proceeds of the
Partnership (other than those associated with Class A Partnership Interests),
all subject to and interpreted in accordance with the terms of this Agreement.

      "Code" means the Internal Revenue Code of 1986, as amended, or any
subsequent federal law concerning income taxes that is enacted in substitution
for the Code.

      "General Partner" Means any Person admitted as a general partner in
accordance with this agreement.

      "General Partnership Interest" means the Partnership Interest of a
Managing General Partner, in his capacity as a Managing General Partner.

      "Limited Partner" means any Person admitted as a limited partner in
accordance with this Agreement.

      "Limited Partnership Interest" means the Partnership Interest of a Limited
Partner, in the capacity as a Limited Partner.

      "Majority in Interest" when used in regard to the degree of consent,
approval or agreement required among the Partners, means Partners whose
aggregate Percentage Interests constitute over 50% of the total aggregate
Percentage Interests then outstanding.

      "Managing General Partner" means the Person designated in this Agreement
as the general partner responsible for management of the affairs of the
Partnership, including all voting rights with respect to, and control over,
Marketable Securities, and thereafter any Person which becomes a general partner
responsible for management of the affairs of the Partnership pursuant to this
Agreement, in the Person's capacity as a managing general partner of the
Partnership.

      "Marketable Securities" means securities, including stock, which are
traded on an established securities market, whether or not registered under the
Securities Act of 1933.

      "Partner" means each Person which is a Managing General Partner or a
Limited Partner.


                                        7
<PAGE>

      "Partnership" means the McGillicuddy Investments Limited Partnership III,
the limited partnership formed in accordance with the Act pursuant to this
Agreement.

      "Partnership Interest" includes only a Partner's Capital Contribution and
right to receive his Percentage Interest and excludes Partnership Rights.

      "Partnership Rights" excludes the Partnership Interest of a Partner, and
includes, in addition to other rights provided in this Agreement, the rights
provided to him by the Act except to the extent such rights are inconsistent
with the provisions of this Agreement.

      "Percentage Interest" shall mean a partner's percentage share from time to
time of the Net Profits and Net Losses, taxable income or taxable loss, Cash
Receipts, cash and other distributions and liquidation proceeds of the capital
of the Partnership attributable to a particular class of Partnership Interests
all subject to and interpreted in accordance with the terms of this Agreement.
The Percentage Interest of partners for each class of Partnership Interests
shall be proportionate to the Capital Accounts of the partners in that class of
Partnership Interest at all times so that, for example, if a Partner's Capital
Account in one class is 100 and the aggregate of all Capital Accounts in the
same class of Partnership Interest is 1000, the partner's Percentage in that
class of the Partnership is 10%. Except as otherwise provided in this Agreement,
in the event of a change among the partners in the Percentage Interest in the
Partnership during the year, the Partnership shall use a closing-of-the-books
method with respect to such change or changes in Percentage Interest in
computing a partner's share of profits and losses, taxable income and taxable
losses, and entitlement to distributions during such year.

      "Person" means any individual and any general or limited partnership,
corporation, estate, joint venture, trust, business trust, cooperative,
association or other organization.

      "Profits and Losses" means the annual net income or loss of the
Partnership determined on a generally accepted accounting principles basis, as
disclosed on the annual financial statements of the Partnership, except that
Profits and Losses shall be computed separately for each of the Class A
Partnership Interests and Class B Partnership Interests. If the Partners have
elected for the Partnership to be excluded from the application of Subchapter K
of Chapter 1 of the Code, the provisions relating to Profits and Losses shall be
of no effect during such period at the Partnership level, but will be separately
computed for each Partner.

      "Property" means any real, personal, tangible or intangible property
contributed by a Partner to the equity of the Partnership or otherwise acquired
by the Partnership.

      "Pro Rata" means in the proportion that the Percentage Interest of each
Partner bears to the total Percentage Interests of all the Partners.


                                        8
<PAGE>

      "Retirement" means the death, Bankruptcy, adjudication of incompetency as
determined by a court of appropriate jurisdiction, dissolution and liquidation
or termination of existence, merger or consolidation (except as provided in
sections 33 and 34) of a Partner, or the sale, lease or other disposition of all
or substantially all the property of a Partner (except as provided in sections
33 and 34).

      "Taxable Income or Taxable Loss" means the net income or loss of the
Partnership for federal income tax purposes, as determined at the close of the
Partnership's fiscal year by the accountants employed by the Partnership to
prepare its income tax returns. If the Partners have elected for the Partnership
to be excluded from the application of Subchapter K of Chapter 1 of the Code,
the provision shall be of no effect for federal income tax purposes during such
period, but will be separately computed for each Partner.

      2. Captions and Certain Terms. The titles and captions preceding the text
of the articles and sections of this Agreement are solely for convenience of
reference and neither constitute a part of this Agreement nor affect its
meaning, interpretation, or effect. The words "hereby," "herein," "hereof,"
"hereto," "hereunder," and terms of similar import refer to this Agreement as a
whole and not to any particular article, section, subsection or other part of
this Agreement.

      3. Severability. If any article, section or other provision of this
Agreement, or its application, is held to be invalid, illegal or unenforceable
in any respect or for any reason, the remainder of this Agreement and the
application of such article, section or other provision to a person or
circumstance with respect to which it is valid, legal and enforceable is not
affected.

      4. Limitation of Grant. Nothing in this Agreement, whether express or
implied, is intended or may be construed to confer upon, or to grant to, any
creditor or any other Person (other than the Partners and their legal and
personal representatives, heirs, successors and permitted assignees) any right,
remedy or claim under or because of this Agreement or any covenant, condition or
stipulation of it.

                                   ARTICLE II

                           ORGANIZATION OF PARTNERSHIP

      5. A. Formation, Name, Office and Registered Agent. The Partnership was
organized as of the effective date of this Agreement and the signatories to this
Agreement constitute the members of this Partnership under the Act as of such
date and as of the date hereof. The rights and obligations of the Partners are
determined by the Act, except as otherwise expressly provided in this Agreement.
The name of the Partnership is "MCGILLICUDDY INVESTMENTS LIMITED PARTNERSHIP
III."


                                        9
<PAGE>

The record keeping office of the Partnership and its principal place of business
are located at the residence of the Managing General Partner where the Managing
General Partner performs administrative services on behalf of the Partnership.
The Partnership does not have a principal business office. The Managing General
Partner may change the name of the Partnership or may designate the location of
its principal business office at any time and from time to time by giving
written notice of such change to each Partner. The registered agent and
registered office of the Partnership is The Corporation Trust Company, 1209
Orange Street, Wilmington, DE 19801.

            B. General and Limited Partners. Dennis J. McGillicuddy, Jr. is the
initial General Partner of the Partnership. The limited partners of the
Partnership are Dennis J. McGillicuddy and Graciela S. McGillicuddy.

            C. Certificate of Limited Partnership. In connection with the
execution of this Agreement, the Managing General Partner signed a certificate
of limited partnership, pursuant to the Act. The Managing General Partner shall
cause the certificate to be filed with the Delaware Secretary of State. The
certificate also has been amended to implement the change in General Partners.
The Managing General Partner shall amend the certificate when required under
this Agreement and shall execute the amended certificate as required by the Act.

      6. Purpose of Partnership

            (a) Except as provided in 6(c) below, the purposes of the
Partnership are to:

                  (i) invest in, own, sell, acquire, manage and exercise the
voting rights associated with Marketable Securities,

                  (ii) after approval by a Majority in Interest, acquire, hold,
sell, own, improve, develop or lease other types of property in addition to
Marketable Securities, and

                  (iii) engage in any other lawful activity for profit approved
by an affirmative vote of a Majority in Interest.

            (b) Notwithstanding Section 6(a), unless unanimously approved by the
Partners, the Partnership shall not engage in any activity(ies) which would
result, based upon opinion of tax counsel, in the characterization of the
Partnership as an investment company as that term is used in Section 721(b) or
any successor provision of the Code.

            (c) Subsequent to the date of commencement of existence of the
Partnership, the Partners may make the election set forth in Treas. Reg. ss.
1.761-2 to have the Partnership excluded from the application of Subchapter K of
Chapter 1 of the Code until such time as a Majority in Interest determine to
have the Partnership engage in an


                                       10
<PAGE>

activity other than investing in Marketable Securities and other intangible
assets. Until such time as the Partnership engages in other than investment
activities, and if the aforementioned election is made, it is the intention of
the Partners that the Partnership shall be only for investment purposes and
shall not actively conduct business. It is the intention of the Partners that
the Partnership shall have legal title to, and ownership of, Marketable
Securities so as to effectuate the co-ownership of the Marketable Securities by
the Partners. As is evidenced by various provisions of this Agreement, each
Partner reserves the right separately to take or dispose of their shares or
interests in the Marketable Securities and the other assets contributed by such
Partner to the Partnership. Further, during the period Subchapter K does not
apply to the Partnership, this Agreement is to be interpreted in a manner that
will give effect to such election.

      7. Term of Partnership. The term of the Partnership shall continue until
the earlier of (i) December 31, 2020, or (ii) the death or adjudication of
incompetency as determined by a court of appropriate jurisdiction of Dennis J.
McGillicuddy, unless the Partnership is earlier dissolved and terminated under
this Agreement.

      8. Authorized Acts. In furtherance of its purposes, but subject to every
other provision of this Agreement, the Partnership, through, and only through,
the actions of the Managing General Partner acting alone, is authorized to do
the following:

            (a) acquire by purchase, lease or otherwise, any real or personal,
tangible or intangible property that may be necessary, convenient or incidental
to the accomplishment of the purposes of the Partnership;

            (b) construct, operate, maintain, finance, improve, own, sell,
convey, exchange, assign, mortgage or lease any property (or a part thereof) as
may be necessary, convenient or incidental to the accomplishment of the
purposes of the Partnership;

            (c) borrow money and issue evidences of indebtedness in furtherance
of any purpose of the Partnership and secure the same by a mortgage, pledge,
security interest or other liens on the property, any part thereof, any interest
therein or on any improvements thereto;

            (d) prepay, in whole or in part, refinance, increase, renew, modify
or extend any indebtedness of the Partnership and, in connection therewith,
extend, renew or modify any mortgage, pledge, security interest or other lien
affecting any property;

            (e) invest and reinvest the assets of the Partnership in, and
purchase, acquire, hold, sell, transfer and exchange securities of all kinds,
including Marketable Securities;

            (f) lend money to Partners;

            (g) exercise the voting rights associated with property owned by the
Partnership; and


                                       11
<PAGE>

            (h) enter into any activity and perform and carry out any contract
in connection with, or necessary or incidental to, the accomplishment of the
purposes of the Partnership.

      9. Co-Ownership of Partnership Interests. Any consent required by a
Partner shall require the action or vote of each Person (or in such other manner
as such Persons have designated in writing to the Partnership) having an
interest in such Partnership Interest, with a majority approval needed for
consent. On the death of a co-owner of a Partnership Interest held in either
joint tenancy with right of survivorship or tenancy by the entirety, the
Partnership Interest is owned solely by the survivor as a Partner, and not as an
assignee. The Partnership need not (although it may) recognize the death of a
co-owner of a Partnership Interest until the Managing General Partner receives
notice of the death. A co-owner of a Partnership Interest may sever the tenancy
by giving to the Managing General Partner notice to that effect, and signed by
the co-owner requesting the severance in the case of a joint tenancy, and by
both co-owners in the case of a tenancy by the entirety. Upon receipt of the
notice and the certificate evidencing the Partnership Interest owned by the
co-owners, the Managing General Partner shall cause the Partnership Interest to
be allocated as directed by the co-owners and shall indicate on the Partnership
records such allocation. In absence of joint direction, the interests shall be
allocated between the owners as the severed ownership interests would be valued
for federal estate tax purposes.

      10. Representations and Warranties of the Limited Partners. As a condition
to becoming a Limited Partner of the Partnership, each Limited Partner
represents, warrants, and covenants to each Managing General Partner and the
Partnership as follows:

            (a) He will not assign, sell, mortgage, pledge, or otherwise
transfer or encumber any of his rights under this Agreement except as expressly
permitted under this Agreement and applicable laws;

            (b) He was granted full and unrestricted access to the Partnership's
business premises, offices and properties and its business, partnership and
financial books and records as he required, and was permitted to examine the
foregoing, to question the Managing General Partner, and to make all other
investigations that he considered appropriate to determine or verify the
business or condition (financial or otherwise) of the Partnership and to
consummate the transactions contemplated by this Agreement;

            (c) The Partnership furnished him all additional information
concerning the Partnership's business and affairs that he requested;

            (d) He was permitted to ask questions of, and to receive answers
from, the Managing General Partner concerning the terms and conditions of an
investment in a Limited Partnership Interest, and to obtain all additional
information he considered necessary to verify the accuracy of the information
received by him from the Managing


                                       12
<PAGE>

General Partner, and he understands the risks associated with an investment in
the Partnership and that such an investment is highly speculative;

            (e) Because of his considerable knowledge and experience in
financial and business matters in general and securities investments in
particular, he is able to evaluate the merits, risks, and other factors bearing
on the suitability of a Limited Partnership Interest as an investment;

            (f) His income and net worth are such that he is not now, and does
not contemplate being, required to dispose of any investment in the Partnership
to satisfy any existing or expected obligation, and he is otherwise fully able
to bear the economic risks of his proposed investment in the Partnership,
including the risk of losing all or any part of his investment in the
Partnership and the probable inability to sell, transfer, or pledge, or
otherwise dispose of an investment in the Partnership for an indefinite period;

            (g) He is acquiring a Limited Partnership Interest solely for his
own account, as principal, for investment purposes and not with a view to or for
resale in connection with any distribution or underwriting of any Partnership
Interests;

            (h) He understands that the Limited Partnership Interest that he
will purchase has not been and will not be registered under either the
Securities Act of 1933 or any state securities law, that he must hold the
Limited Partnership Interest indefinitely unless the Partnership Interests are
subsequently registered under those laws or transferred in reliance on advice of
counsel satisfactory to the Partnership that registration under those laws is
not required, and that stop-transfer instructions will be noted in the
appropriate records of the Partnership;

            (i) He understands that the document evidencing a Limited
Partnership Interest acquired by him will bear the following legend:

            These securities have not been registered under either the
            Securities Act of 1933 or any state securities law and were acquired
            pursuant to an investment representation by the record owner. These
            securities are not transferable absent either registration under the
            Act and every applicable state securities law or advice of counsel
            satisfactory to the Partnership that registration in not required.
            Additionally, these securities are subject to certain transfer
            restrictions set forth in the Limited Partnership Agreement of the
            Partnership. Reference may be made to the Limited Partnership
            Agreement for the details of those restrictions.

            (j) He understands that a legend substantially identical to the one
described above will be placed on every new document issued upon a transfer of a
Limited Partnership Interest;


                                       13
<PAGE>

            (k) He shall not sell, transfer, pledge, or otherwise dispose of any
part of his Limited Partnership Interest, unless the Partnership Interests are
registered under the Securities Act of 1933 and under every applicable state
securities law or unless the Partnership is furnished with advice of counsel
satisfactory to it that registration under those laws is not required; and

            (l) He understands that the Partnership does not file periodic
reports with the Securities and Exchange Commission pursuant to the Securities
Exchange Act of 1934.

                                   ARTICLE III

                               PARTNERSHIP CAPITAL

      11. Capital Contributions.

            (a) Upon executing this Agreement, each Partner shall make or has
made a Capital Contribution in the amount and of the type, and initially shall
have a Percentage Interest equal to the percentage, set forth opposite his name
on Exhibit A. Partners may make (but Limited Partners are not required to make)
additional Capital Contributions at such time and in such amount as they in
their sole discretion shall determine but only if the Managing General Partner
and a Majority in Interest consent to such additional Capital Contributions.
Upon the assignment of any Partnership Interest, the making of an additional
Capital Contribution or any return of a Capital Contribution, or any
substitution of a Partner, Exhibit A shall be amended to accurately reflect the
name, address, Capital Contribution and Percentage Interest of each Partner.
Each Partner will also be assigned either or both a Class A and Class B
Partnership Interest depending on the assets contributed by each Partner and as
they shall mutually agree at the time of contribution.

            (b) Notwithstanding (a) above, no Capital Contributions shall be
made or permitted by any Partner which would result, directly or indirectly, in
the Partnership being treated as an investment company under section 721(b) of
the Code, and any such attempted Capital Contribution shall be void ab initio.
The Managing General Partner shall withhold its consent to the making of an
additional Capital Contribution, unless it has satisfied itself (by seeking
advice of legal counsel or otherwise) that the making of the additional Capital
Contribution will not result, directly or indirectly, in the Partnership being
treated as an investment company under section 721(b) of the Code.

            (c) A Partner shall not receive from the Managing General Partner or
out of Partnership Property, and the Managing General Partner and the
Partnership shall not return to a Partner, any part of his Capital Contribution,
except as set forth in Articles V, VIII and IX of this Agreement and such
distribution is determined to be a return of a Partner's Capital Contribution,
and then only if all liabilities of the Partnership, except liabilities to the
Partners on account of their Capital Contributions,


                                       14
<PAGE>

have been paid or there remains property of the Partnership sufficient to pay
them. The Partnership shall not pay interest on Capital Contributions, and, a
Partner may demand and receive only cash in return for his Capital Contribution,
except to the extent provided for in Articles V and IX of this Agreement or
unless the Liquidator (as defined in section 37) decides to distribute
Partnership property in kind upon the dissolution, winding-up, and termination
of the Partnership, or unless the distribution of property to a Partner is
unanimous1y approved by the Partners. Each Partner, by signing this Agreement
or a counterpart of it, consents to all distributions authorized by this
Agreement and releases all other Partners from all liability to both him and the
Partnership for all distributions made in accordance with this Agreement.

      12. Capital Account

            (a) The Managing General Partner shall establish and maintain a
Capital Account for each Partner in the Partnership's books of account. Capital
Accounts shall be maintained and adjusted in accordance with generally accepted
accounting principles. A Limited Partner shall not be obligated to restore a
deficit balance in its Capital Account, except to the extent required by the
Act. Consistent with these capital account maintenance rules, the Managing
General Partner shall credit to each Partner's Capital Account the amounts of
the Partner's Capital Contributions and any Profits allocated to the Partner.
The Managing General Partner shall charge to or deduct from each Partner's
Capital Account the amounts of all distributions (in cash or other property) or
the Partner and any Losses allocated to the Partner. If any interest in the
Partnership is transferred in accordance with the terms of this Agreement, the
transferee shall succeed to the Capital Account of the transferror to the extent
it relates to the transferred interest.

            (b) The provisions of this section and the other provisions of this
Agreement pertaining to the maintenance of Capital Accounts are intended to
comply with Treasury Regulation Section 1.704-1(b) (or any successor provision
thereto), and shall be interpreted and applied in a manner consistent with such
Regulations. In the event that Managing General Partner determines that it is
prudent to modify the manner in which the Capital Accounts are computed in order
to comply with such Regulations, provided that it is not likely to have a
material effect on the amounts distributable to any Partner without such
Partner's consent and upon receipt of an opinion of tax counsel to the
Partnership concluding that such modification will be given effect for federal
income tax purposes, the Managing General Partner may make such modification.

            (c) The Managing General Partner shall revalue the Partnership's
Property (based on its fair market value as of the moment immediately preceding
the relevant event) and shall adjust Capital Accounts to take into account any
resulting Profit or Loss (determined as if the Partnership sold all its Property
for cash equal to the Property's fair market value) upon the occurrence of
either of the following events: (1) the making by any Partner of any non-Pro
Rata additional Capital Contribution, (2) the partial or complete withdrawal of
a Partner's Partnership Interest, or (3) the admission of a Partner.


                                       15
<PAGE>

            (d) For the purposes of determining Percentage Interests, making
allocations and distributions pursuant to Articles IV and V, and wherever else
relevant in this Agreement, multiple Capital Accounts shall be maintained for
each partner who owns more than one class of Partnership Interest. A combined
Capital Account shall also be maintained for each partner who has more than one
class of Partnership Interest. The combined Capital Account shall be relevant
for determining the total amount of distributions to a Partner in the event of
the liquidation of the Partnership. In the event that a Partner with more than
one class of Partnership Interest has a positive combined Capital Account
balance at the time of the liquidation of the Partnership, but has a deficit in
one of the separate Capital Accounts, liquidating distributions shall be made
only to the extent of the net positive balance.

      13. Expenses Paid by Partners. Any Partnership expense reasonably paid by
any Partner on behalf of the Partnership is an indebtedness of the Partnership
to the Partner and does not increase the Partner's Partnership Interest or
Percentage Interest. The Partnership shall reimburse the Partner as soon as
practicable and may pay interest on the indebtedness.

      14. Loans by Partners; Restrictions on Borrowing. The Managing General
Partner may borrow money on behalf of the Partnership from any Partner in such
amounts and for such purposes as it considers necessary, convenient or
incidental to the accomplishment of the purposes of the Partnership. Each loan
to the Partnership by a Partner (excluding reimbursable expenses) shall be
evidenced by a promissory note or similar instrument of the Partnership, may be
secured by a lien on the Property, may bear interest at a rate determined by
agreement between such Partner and the Managing General Partner and may be
subject to such other terms and conditions as are agreed to by such Partner and
the Managing General Partner. The Partnership may prepay each loan from a
Partner in whole or in part, at any time and from time to time, without premium
or penalty. The Managing General Partner may not borrow money from persons other
than Partners or pledge Partnership assets without the express written consent
of the non-managing general partner.

                                   ARTICLE IV

             PROFITS AND LOSSES AND TAXABLE INCOME AND TAXABLE LOSS

      15. Allocations.

            (a) Allocation of Profits and Losses.

                  (i) Profits and Losses of the Partnership shall be determined
for each fiscal year of the Partnership in accordance with the cash method of
accounting, with such exceptions thereto as are set forth in this Agreement, and
otherwise in accordance with generally accepted accounting principles applied in
a consistent manner.


                                       16
<PAGE>

                  (ii) Except as otherwise provided, the Partnership's Losses,
if any, arising in a fiscal year shall be allocated among the Partners as
follows:

                        (1) FIRST: To the extent of the aggregate positive
Capital Account balances of the Partners as of the end of the fiscal year, Pro
Rata to the Partners taking into account any changes in Partnership Percentage
Interests during the fiscal year.

                        (2) SECOND: Pro Rata, to the Managing General Partner.

                  (iii) Profits arising in a fiscal year shall be allocated
among the Partners as follows:

                        (1) FIRST: To the Managing General Partner until Profits
allocated to the Managing General Partner during the term of the Partnership
pursuant to this Section 15(a)(ii)(1) equal Losses allocated to the Managing
General Partner during the term of the Partnership pursuant to Section
15(a)(ii)(2) then

                        (2) SECOND: To the Partners Pro Rata taking into account
any changes in Partnership Percentage Interests during the fiscal year.

            (b) Allocation of Taxable Income and Taxable Loss.

                  (i) Except as otherwise provided in this section l5(b),
allocations of tax items among the Partners shall be consistent with
corresponding book (Profits and Losses) items (if any). For tax purposes,
Profits and Losses, or any item thereof, shall be appropriately adjusted to
reflect Taxable Income and Taxable Loss, or any item thereof, as determined
under the Code and shall be allocated among the Partners in such a manner as to
comply with the provisions of the Code and Regulations thereunder (including, if
necessary, the "minimum gain chargeback provisions" of the Regulations under
Section 704 of the Code). For example, any gain or loss recognized by the
Partnership with respect to property contributed to the Partnership by a Partner
shall be shared among the Partners so as to take account of the variation, if
any, between the basis of the property to the Partnership and its fair market
value at the time of contribution or revaluation, whichever is applicable, so as
to comply with the requirements of Section 704 of the Code. Thus, for example,
if a Partner contributes Property to the Partnership whose agreed fair market
value exceeds its adjusted basis in the hands of the contributing Partner
("built-in gain"), and there have been no events giving rise to a revaluation,
built-in gain with respect to such contributed Property shall first be allocated
to such contributing Partner when the Partnership recognizes gain upon a
disposition of such contributed Property, but not in an amount in excess of such
built-in gain; the remaining balance of such recognized gain, if any, shall be
allocated among the Partners as set forth herein. The allocation of built-in
gain to a contributing Partner shall not increase such Partner's Capital
Account, because such gain was already taken into account when the built-in gain
property was contributed to the Partnership. A Partner


                                       17
<PAGE>

who contributes property other than cash shall provide the Managing General
Partner with information necessary to verify the contributing Partner's adjusted
tax basis in the items of property contributed by him to the Partnership.

                  (ii) Generally, except as provided in section l5(b)(i),
Taxable Income and Taxable Loss (and each such income and loss item) shall be
allocated Pro Rata among the Partners. In the event, however, that non-Pro Rata
distributions of property are made to a Partner or the net proceeds from the
sale of property are distributed non-Pro Rata to a Partner, Taxable Income and
Taxable Loss derived from such distributions or sales shall be allocated 100% to
such Partner, subject only to such modifications as are necessary to comply with
Section 704 of the Code. In addition, no allocations of Taxable Loss shall be
made to a Limited Partner that would create a deficit balance in the Limited
Partner's Capital Account.

                                    ARTICLE V

                      DISTRIBUTIONS, WITHDRAWALS AND LOANS

      16. Distributions

            (a) Cash Flow Distributions. Cash Flow is to be distributed
periodically as the Managing General Partner shall determine.

            (b) Partial or Complete Withdrawal by a Partner From the
Partnership.

                  (i) In the event of a partial or complete withdrawal of a
Partner from the Partnership pursuant to Article VIII, the Managing General
Partner shall, as promptly as is reasonably possible, distribute to the Partner
any assets then owned by the Partnership that were previously contributed by
such Partner to the Partnership but this distribution shall be limited to the
extent it would cause the Capital Account of such Partner to be negative. If the
Partner has a positive Capital Account balance, then the Partnership shall
distribute to the Partner his Pro Rata share of the Marketable Securities, cash
and other readily divisible assets of the Partnership. The withdrawing Partner
shall also be entitled to receive cash equal in value to his Pro Rata share of
the fair market value (as reasonably determined by the Managing General Partner)
of any non-readily divisible assets owned by the Partnership. The Managing
General Partner shall, as promptly as possible, distribute this additional
amount of cash, if any, to the withdrawing Partner. Cash distributions to the
withdrawing Partner shall be reduced by such Partner's Pro Rata share of the
liabilities of the Partnership and by any expenses incurred by the Partnership
with respect to the withdrawal of the Partner.

                  (ii) A Partner may request that all or a portion of the
Marketable Securities subject to the requested withdrawal be sold by the
Partnership and the net proceeds (after selling and other expenses) distributed
as directed by him. In the


                                       18
<PAGE>

event that the Managing General Partner is unable or unwilling to sell these
Marketable Securities, it shall distribute them to the Partner, unless it is
notified by the Partner to cancel the withdrawal.

                  (iii) The Managing General Partner shall not be required to
distribute to the requesting Partner any assets that the Partnership is legally
restricted or prohibited from distributing to the Partner, unless steps can be
taken to remove the restriction or prohibition; in which case the requesting
Partner shall be charged with the expense of removing such restriction or
prohibition. Any distribution hereunder shall also be subject to the limitations
set forth in sections 11(c) and 17, respectively.

            (b) Liquidating Distributions. The net proceeds from liquidation of
the Partnership's assets pursuant to its dissolution, winding-up, and
termination shall be distributed, and all Profits and Losses resulting from the
liquidation of the Partnership Property shall be allocated, among the Partners
in the proportions and orders of priority specified in this section 16(c).

                  (i) The Liquidator shall distribute the net proceeds from
liquidation of the Partnership's assets as follows:

                        (1) FIRST: To pay all the liabilities of the Partnership
that are then due and payable, except for both Capital Contributions of Partners
and liabilities to the Partners, in the order of priority required by Delaware
law; then

                        (2) SECOND: To establish any reasonable reserve that the
Liquidator may determine is required for unpaid, future, or contingent
liabilities or obligations of the Partnership; then

                        (3) THIRD: To pay all liabilities of the Partnership to
the Partners; Pro Rata according to the amounts of their respective liabilities;
then

                        (4) FOURTH: To the Partners to the extent of any
positive balances in their Capital Accounts, Pro Rata according to the amounts
of their respective positive balances; then

                        (5) FIFTH: Any remaining net proceeds shall be
distributed Pro Rata among the Partners.

                  (ii) Any Profits and Losses and Taxable Income and Taxable
Loss resulting from the disposition of the Partnership's assets in the process
of liquidation shall be allocated among the Partners in the manner provided in
section l5. Any Property distributed in kind in the liquidation shall be valued
and treated as if the Property were sold and the cash proceeds were distributed.
The Profits and Losses


                                       19
<PAGE>

arising from the constructive sale of the Property described in the preceding
sentence shall be allocated among the Partners in the manner provided in section
15.

      17. Limitation on Distributions to Partners. A Partner may receive
distributions from the Partnership only to the extent the Partnership's total
assets exceed its total liabilities, other than liabilities to the Partners on
account of their Capital Contributions.

                                   ARTICLE VI

                 AUTHORITY, DUTIES, AND LIABILITIES OF PARTNERS

      18. Duties of Managing General Partner. The Managing General Partner, and
no other Partners, shall manage the affairs of the Partnership, shall apply
himself diligently for the Partnership, and shall devote to the Partnership such
time as is necessary and appropriate to manage the business of the Partnership.
The Managing General Partner is not required to devote all its business time to
the Partnership, and it may engage in other business ventures and employment,
including those in competition with the Partnership. In the performance of its
duties, the Managing General Partner may hire employees and agents of the
Partnership and generally shall supervise and direct all the daily operations of
the Partnership.

      19. Managing General Partner's Fees and Expenses.

            (a) Fees to Managing General Partner. In consideration for
performing services described herein, the Managing General Partner may be paid a
fee as agreed to by a Majority in Interest. Such fees shall be deemed earned
when the services have been performed and, regardless of when paid, shall be
non-executory from the date earned and shall be the obligation of the
Partnership from and after that date.

            (b) Expenses. Except as otherwise provided herein, the Partnership
shall pay all expenses of the Partnership (which expenses may be either billed
directly to the Partnership or reimbursed to the Managing General Partner) which
may include, but are not limited to: (i) all costs of borrowed money, taxes and
assessments on the Property and other taxes applicable to the Partnership; (ii)
all costs for goods and materials, whether purchased by the Partnership directly
or by the Managing General Partner on behalf of the Partnership; (iii) legal,
audit, accounting, brokerage and other professional fees; (iv) fees and expenses
paid to independent contractors, mortgage bankers, brokers, insurance brokers
and other agents; (v) expenses of organizing, revising, amending, converting,
modifying or terminating the Partnership; (vi) expenses in connection with
distributions made by the Partnership to, and communications and bookkeeping
work necessary in maintaining relations with, Partners; (vii) expenses in
connection with preparing and mailing reports to Partners; (viii) costs of any
accounting, statistical or bookkeeping equipment necessary for the maintenance
of the books and records of the Partnerships; (ix) the cost of preparation and
dissemination of informational material and documentation relating to the
Partnership; (x) except with respect to litigation solely


                                       20
<PAGE>

among the Partners as such, costs incurred in connection with any litigation in
which the Partnership is involved, as well as in the examination, investigation
or other proceedings, conducted against the Partnership by any regulatory
agency, including legal and accounting fees incurred in connection therewith;
(xi) costs of any computer services or equipment or services of personnel used
for or by the Partnership; and (xii) expenses of professionals employed by the
Partnership in connection with any of the foregoing, including attorneys,
accountants and appraisers.

      20. Authority of Managing General Partner. Except as otherwise provided
herein, the Managing General Partner may bind the Partnership to do all acts
that are necessary, appropriate, or incidental to the accomplishment of the
purposes of the Partnership. Any person dealing with the Partnership or the
Managing General Partner may rely on a certificate signed by the Managing
General Partner as to the identity of any Partner, the existence or absence of
any fact or condition that is necessary to permit action by either the
Partnership or the Managing General Partner or germane in any other way to the
affairs of the Partnership, and the persons who are authorized to execute and
deliver any documents or instruments of or on behalf of the Partnership. Without
limiting the generality of the foregoing, the Managing General Partner is
specifically authorized to do the following:

            (a) to negotiate and enter into leases and agreements with land or
building owners or other Persons, and to incur obligations for, and on behalf
of, the Partnership in connection with Partnership business;

            (b) to borrow money on behalf of the Partnership and, as security
therefore, to encumber the Property;

            (c) to prepay, in whole or in part, refinance, increase, modify or
extend any obligation affecting the Property;

            (d) to sell, exchange, convey and lease the Property;

            (e) to employ from time to time, at the expense of the Partnership,
other Persons required for the operation and management of the Partnership
business, including accountants, attorneys and others, who may be Partners, on
such terms and for such compensation as the Managing General Partner determines
to be reasonable and this may include Persons which are Affiliates;

            (f) to pay all attorney's and accountant's fees and other costs
incurred in connection with the formation of the Partnership business and the
completion of all steps necessary or advisable for the Partnership to comply
with applicable laws;

            (g) to assume the responsibilities imposed on the Managing General
Partner by the Act;


                                       21
<PAGE>

            (h) to compromise, arbitrate or otherwise adjust claims in favor of
or against the Partnership and to carry such insurance as the Managing General
Partner considers advisable;

            (i) to exercise the voting rights associated with the securities and
other Property owned by the Partnership;

            (j) to commence or defend litigation with respect to the Partnership
or any assets of the Partnership as the Managing General Partner considers
advisable, at the expense of the Partnership;

            (k) to make, execute, acknowledge and deliver documents of transfer
and conveyance and any other instruments that may be necessary or appropriate to
carry out its powers; and

            (l) to do all such acts and take all such proceedings and execute
all such rights and privileges, although not specifically mentioned herein, as
the Managing General Partner considers necessary to conduct the business of the
Partnership and to carry out the purposes of the Partnership.

            Notwithstanding the foregoing, the Managing General Partner shall
not take any of the fo11owing actions without the consent of a Majority in
Interest:

                        (1) assign all or any part of the property for the
benefit of its creditors or confess a judgment against the Partnership;

                        (2) take any action in contravention of the Act, the
certificate of limited partnership or this Agreement;

                        (3) sell, lease, transfer, assign, pledge or encumber
the property of the Partnership (except with respect to transactions to which
section 32 or section 37 applies);

                        (4) loan an amount of money in excess of $100,000 to a
Partner; or

                        (5) admit a Person as a Managing General Partner of the
Partnership.

      21. Special Limitation. During the period the Partners have determined
that the Partnership will only be availed of only for investment purposes, which
shall be the period, if any, contemplated by Section 6(c), the Managing General
Partner may not purchase, sell, or exchange Marketable Securities or assets that
pertain to a Class B Partnership Interest without the consent of the Partners to
whom the Marketable Securities are deemed owned or allocated for federal income
tax purposes, but the


                                       22
<PAGE>

Managing General Partner shall have voting rights and all other aspects of
management and control over such Marketable Securities and assets to which a
Class B Partnership Interests pertains.

      22. Dealing with Affiliates. The Managing General Partner may employ and
enter into contracts and other arrangements with any Person, including an
Affiliate, and may obligate the Partnership to pay reasonable compensation for
services rendered by such Persons on terms that, in the judgment of the Managing
General Partner, are not less favorable to the Partnership than would be
available from an unrelated party.

      23. Indemnification of Managing General Partner. The Managing General
Partner need not secure the performance of its duties by bond or otherwise. A
Managing General Partner is not liable, responsible, or accountable in damages
or otherwise to any Partner or to the Partnership for any act taken or omission
made in good faith on behalf of the Partnership and in a manner that such
Managing General Partner reasonably believes to be within the scope of the
authority granted to it by this Agreement and in the best interest of the
Partnership, except for gross negligence or willful misconduct. Any loss,
expense (including attorneys' fees) or damage incurred by a Managing General
Partner by reason of any act or omission by it in good faith on behalf of the
Partnership and in a manner that it reasonably believes to be within the scope
of the authority granted to it by this Agreement and in the best interest of the
Partnership (but not, in any event, any loss, expense or damage incurred by a
Managing General Partner by reason of gross negligence or willful misconduct)
shall be paid to the indemnified Managing General Partner from the Partnership's
assets, to the extent available.

      24. Liability of Limited Partners. The liability of each Limited Partner
is limited to its Capital Contributions. Except as provided by the Act, a
Limited Partner is not required to contribute money to, or for the liabilities
of the Partnership, and is not personally liable for any loss, liability or
other obligations of the Partnership.

      25. Authority of Limited Partners and Non-Managing General Partners. The
Limited Partners shall not participate in the management of, or have any control
over, the business or policies of the Partnership, nor any control over
Marketable Securities, except as required by the Act or permitted by section 20,
and the Limited Partners shall not transact any business in the name of the
Partnership. Notwithstanding the foregoing, the Partners may make the election
set forth in Treas. Reg. ss. 1.761-2 to have the Partnership excluded from the
provisions of Subchapter K of Chapter 1 of the Code. In the event a Partner
ceases (whether through removal, death, or resignation) to serve as Managing
General Partner, a Majority in Interest of the Partners shall appoint another
Partner to serve as the Managing General Partner.


                                       23
<PAGE>

                                   ARTICLE VII

                        TRANSFER OF PARTNERSHIP INTERESTS

      26. Limited Partners. A Limited Partner shall not pledge, encumber or
hypothecate his interest in the Partnership without the consent of the Managing
General Partner. Otherwise, subject to sections 28 and 29, and only if the
Managing General Partner consents, a Limited Partner may make an Assignment of a
Limited Partnership Interest. However, an Assignment does not relieve the
Limited Partner of his obligations and liabilities under this Agreement, or
constitute the assignee a Limited Partner, or confer on the assignee any
Partnership Rights. An assignee of a Limited Partner's Partnership Interest may
be admitted and substituted as a Limited Partner and acquire Partnership Rights
only upon the satisfactory completion of the requirements specified in section
29. The failure or refusal of the Managing General Partner to consent to the
admission of an assignee as a Limited Partner does not affect the right of the
assignee to the Partnership Interest of his predecessor in interest.

      27. Managing General Partner. Subject to section 28, a Managing General
Partner may make an Assignment, directly or indirectly, of all or any part of
its Partnership Interest. However, an Assignment does not relieve such Managing
General Partner of its obligations and liabilities under this Agreement, or
constitute the assignee a Managing General Partner, or confer on the assignee
any Partnership Rights. Subject to section 28, and only if a Majority in
Interest consents, a Managing General Partner may make an Assignment of both its
Partnership Interest and its Partnership Rights if the assignee assumes in
writing all such Managing General Partner's obligations and liabilities under
this Agreement and if all the applicable requirements of section 29 are
satisfied. Upon compliance with the immediately preceding sentence, an assignee
of such Managing General Partner has all the rights and powers granted to such
Managing General Partner under this Agreement and has all the obligations and
liabilities of such Managing General Partner under this Agreement.

      28. Restriction on Transfer. Notwithstanding any other provision of this
Agreement, an assignment of a Partnership Interest shall not be made, and
consent thereto shall be withheld:

            (a) Unless the Managing General Partner has satisfied itself (by
seeking advice of legal counsel or otherwise, with any resulting Partnership
expense to be reimbursed by the assignor) that the assignment will not have any
significant adverse tax effect upon the Partnership or the other Partners;

            (b) Unless the Managing General Partner has satisfied itself (by
advice of legal counsel, with any resulting Partnership expense to be reimbursed
by the assignor) that the proposed assignment may be made without registration
under any applicable securities law; and it will not violate any applicable
securities law (including investor


                                       24
<PAGE>

suitability standards);

            (c) If the Assignment is sought to be made to:

                  (i) a minor or incompetent, except if made by will or
intestate succession, or

                  (ii) to a Person which is not an Affiliate.

      29. Admission of Substitute Partner. Subject to the other provisions of
this Agreement, an assignee of a Partnership Interest may be admitted as a
Partner and granted Partnership Rights only if:

            (a) the Assignment is made pursuant to a written instrument in a
form satisfactory to the Managing General Partner and specifies the intention of
the assignor that the assignee be substituted as a Partner;

            (b) the Managing General Partner consents to the admission by
executing two counterparts of this Agreement that evidences the Partnership
Rights of the assignee, and if the assignee is to be admitted as a Partner a
Majority in Interest consent to the admission;

            (c) the assignee accepts, signs and agrees to be bound by this
Agreement, by executing two counterparts of this Agreement, including an amended
Exhibit A, and such other documents or instruments as the Managing General
Partner requires to effect the admission of the assignee as a Partner;

            (d) the assignee provides the Managing General Partner with evidence
satisfactory to it of the assignee's authority to become a Partner under the
terms of this Agreement;

            (e) the assignee pays all filing, publication and other costs
(including reasonable attorneys' fees) incurred by either the Partnership or the
Managing General Partner in connection with the admission and substitution of
the assignee as a Partner. Notwithstanding an assignee's satisfaction of any or
all of the conditions specified above, the Managing General Partner, in its
absolute discretion, may refuse to consent to the assignee's admission as a
Partner, in which event the assignee will not obtain any Partnership Rights, but
will retain only the rights of an assignee under sections 26 or 27.

      30. Rights of Partner After Assignment and Substitution. Upon the
Assignment of all his Partnership Interest, and the admission of a substitute
partner, a Partner shall cease to be a Partner and to have any Partnership
Rights.

      31. Allocations and Distributions After Assignment. For the purposes of
allocations of Profits and Losses, Taxable Income or Taxable Loss, and
distributions, an Assignment of a Partnership Interest is effective as to the
Partnership, and shall be


                                       25
<PAGE>

reflected in the records of the Partnership, as of the date that the Managing
Genera1 Partner receives written notice of the Assignment. The Taxable Income or
Taxable Loss, Profits and Losses and cash and other distributions in respect of
the assigned Partnership Interest with respect to the fiscal year in which the
Assignment of the Partnership Interest occurs shall be divided between the
assignor and the assignee according to the method provided to the Managing
General Partner by the assignor and the assignee, so long as such method is
permitted under the Code and does not adversely affect the other Partners or the
Partnership from a tax or economic perspective. The method of allocation shall
be provided to the Managing General Partner in the written notice of the
Assignment. Any additional costs for computing the allocations hereunder shall
be paid by the assignor or assignee, as the case may be. The written notice
referred to above shall also contain information as to whether the assignor or
assignee shall be responsible for the payment of such additional cost, if any.

                                  ARTICLE VIII

                 RETIREMENT, WITHDRAWAL, OR REMOVAL OF PARTNERS

      32. Withdrawal of Managing General Partner or Limited Partner.

            (a) A Limited Partner may, at any time, withdraw all or part of his
Partnership Interest from the Partnership by providing written notice thereof to
the Managing General Partner. Immediately after the receipt of such written
notice from a Partner, the Managing General Partner shall make the appropriate
distributions to the Partner in partial or complete redemption of his
Partnership Interest as set forth in section 16(b).

            (b) A partial withdrawal by a Partner shall be made in increments of
one tenth (1/10th) of one percent (1%) of a Percentage Interest. The written
notice of withdrawal from a Partner to the Managing General Partner must state
whether the withdrawal is a partial or complete withdrawal and, if a partial
withdrawal, must state the Percentage Interest that is being withdrawn. A
Partner shall not make a partial withdrawal that will result in his remaining
Percentage Interest becoming less than one tenth (1/10th) of one percent (1%)
immediately after the withdrawal.

            (c) The Managing General Partner agrees that it will fully cooperate
to the extent permitted by law to accomplish a withdrawal requested by a Partner
hereunder. It also agrees that it will not take any action that will obstruct or
render impossible the application of this section 32 (such as to pledge the
Partnership's Marketable Securities as collateral to creditors of the
Partnership), unless such action is essential to accomplish the purposes of the
Partnership.

            (d) The partial withdrawal of a Limited Partner does not dissolve or
terminate the Partnership unless there is only one Partner then remaining. The
remaining Partners shall amend this Agreement to reflect the partia1 or complete
withdrawal of the


                                       26
<PAGE>

Partner from the Partnership, if and to the extent necessary.

            (e) Upon the giving of the notice of withdrawal pursuant to
Paragraph (a), and upon the dissolution of the Partnership, the voting rights
with respect to any Marketable Securities allocable to the Percentage Interest
being withdrawn shall be vested in the withdrawing Partner or Partners, and the
Partnership shall have no voting rights with respect to such stock.

            (f) The complete withdrawal of all the Limited Partners shall
constitute a dissolution of the Partnership pursuant to Article IX.

      33. Retirement, Removal, or Withdrawal of Managing General Partner. The
Managing General Partner may withdraw any part of its General Partnership
Interest without the consent of a Majority in Interest. The Retirement, removal,
or withdrawal of the Managing General Partner shall dissolve the Partnership
only if there is no successor General Partner. Notwithstanding the foregoing or
anything else in this Agreement to the contrary, a merger, consolidation, or
reorganization of a Managing General Partner who is not a natural person, or a
sale of all or substantially all its assets that includes its Partnership
Interest, is not a Retirement or withdrawal of such Managing General Partner if
the resulting, surviving or acquiring Person is an Affiliate and becomes
substituted as the Managing General Partner of the Partnership. The resulting,
surviving or acquiring Person is substituted as the Managing General Partner
without further act if it gives notice of the substitution to the Partners
before the effective date of the merger, consolidation, reorganization or sale.
Each Partner consents to the admission and substitution of such substitute
Managing General Partner pursuant to this section 33, and no further consent or
approval of any Partner is required.

      34. Retirement of Limited Partner. The Retirement of a Limited Partner
does not dissolve or terminate the Partnership except as provided in section
36(g), but the legal or personal representatives, heirs, successors, assignees,
or stockholders of a Retired Limited Partner, subject to section 26, shall
succeed to the Partnership Interests of the Retired Limited Partner and may make
an Assignment of the Partnership Interests within the limitations set forth in
this Agreement.

      35. Rights of Partner After Retirement, Removal, or Withdrawal. A Partner
ceases to have any Partnership Rights upon his Retirement, removal, or complete
withdrawal from the Partnership. However, until the appropriate distributions,
if any, are made to a Retired, removed, or withdrawn Partner for his Partnership
Interest, the Retired, removed, or withdrawn Partner is entitled to receive the
allocations of Profits and Losses, Taxable Income or Taxable Loss and all
distributions referred to in section 16 applicable to his Partnership Interest.


                                       27
<PAGE>

                                   ARTICLE IX

                                   DISSOLUTION

      36. Events of Dissolution. The Partnership shall be dissolved, and unless
reconstituted shall be terminated, upon:

            (a) the expiration of its term;

            (b) the vote of a Majority in Interest to dissolve the Partnership;

            (c) the Partnership being adjudicated insolvent or bankrupt;

            (d) the Retirement, removal, or withdrawal of the Managing General
Partner;

            (e) the death of Dennis J. McGillicuddy; or

            (f) the sale of all or substantially all of the Partnership's
Property.

            (g) the complete withdrawal of the Limited Partners.

      37. Winding Up and Distributions. Upon the dissolution of the Partnership
pursuant to section 36, and unless the Partnership is reconstituted, the winding
up of the Partnership's business and the liquidation and distribution of
Partnership assets must be carried out with due diligence and in a timely
manner, and consistent with both the requirements of applicable law and the
following provisions of this section:

            (a) The Managing General Partner shall be responsible for taking all
actions relating to the winding up, liquidation, and distribution of assets of
the Partnership, unless its Retirement, removal, or withdrawal causes the
dissolution, in which case the fiscal agent, liquidator, or receiver appointed
(without judicial action) by a Majority in Interest shall be so responsible. The
Managing General Partner, or the appointed fiscal agent, liquidator, or
receiver, is referred to in this Agreement as the "Liquidator." A Limited
Partner can be appointed to be the Liquidator. The Liquidator shall file all
certificates or notices of the dissolution of the Partnership as required by
law. Upon the complete liquidation and distribution of the Partnership assets,
the Partnership shall terminate, and the Liquidator shall execute, acknowledge,
and cause to be filed all certificates and notices required by law to terminate
the Partnership.

            (b) The Liquidator shall proceed without unnecessary delay to sell
and otherwise liquidate the Partnership's assets. Unless directed otherwise by a
Majority in Interest, all Marketable Securities, cash and other readily
divisible or fungible assets of the Partnership shall be distributed directly to
the Partners in the manner set forth in


                                       28
<PAGE>

section 16(c)(i). The Liquidator shall promptly sell the other assets of the
Partnership unless it determines that an immediate sale of part or all of such
assets would cause undue loss to the Partners. In such case, the Liquidator, to
avoid such loss, may defer the liquidation of the Partnership assets for a
reasonable time, except for those liquidations that are necessary to satisfy the
debts and liabilities of the Partnership to persons and parties other than the
Partners. The Liquidator shall distribute the proceeds from the liquidation of
the Partnership's assets as provided in section 16(c).

            (c) Upon the dissolution of the Partnership pursuant to section 36,
and unless the Partnership is reconstituted, the Liquidator shall cause the
accountants for the Partnership to prepare within ninety (90) days after the
occurrence of the event of dissolution, and immediately thereafter shall furnish
to each Partner, a statement setting forth the assets and liabilities of the
Partnership as of the date of its dissolution. The Liquidator, promptly
following the complete liquidation and distribution of the Partnership's assets,
shall cause the Partnership's accountants to prepare, and the Liquidator shall
furnish to each person who is a Partner immediately before the dissolution, a
statement showing the manner in which the Partnership assets were liquidated and
distributed.

      38. Distribution of Liquidation Proceeds and Assets and Allocation of
Gains and Losses. Subject to the last sentence of 12(d), the net proceeds from
liquidation of the Partnership's assets and the unliquidated Property of the
Partnership shall be distributed, and all Profits and Losses resulting from the
liquidation of the Partnership shall be allocated, among the Partners in the
proportions and orders of priority specified in section 16(c).

      39. Limitation of Liability of Partners. Upon the dissolution of the
Partnership and the distribution of the net liquidation proceeds pursuant to
section 36 and section 16(c), each Partner shall look solely to the assets of
the Partnership for the payment of his unreturned Capital Contributions, and if
the Partnership's assets remaining after the payment or discharge of the debts
and liabilities of the Partnership are insufficient to pay the full amount of
the unreturned Capital Contributions of each Partner, the Partner shall have no
recourse or claim against any Partner or the Partnership with respect to its
unreturned Capital Contributions, except for claims for fraud, gross negligence,
or breach of fiduciary duty.

      40. Waiver of Right of Partition of Assets. Each Partner, and for his
heirs, successors, and assigns, waives his right to the partition of the assets
of the Partnership upon the dissolution and liquidation of the Partnership.

                                    ARTICLE X

                  ACCOUNTING YEAR, BOOKS, RECORDS, AND REPORTS

      41. Books and Records. In accordance with the Act, the Managing General
Partner shall maintain at the principal office of the Partnership a complete and
accurate


                                       29
<PAGE>

set of books of records and accounts, in which it shall make full and complete
entries of all dealings or transactions relating to the Partnership's business
and where it shall keep all supporting documentation of transactions with
respect to the conduct of the Partnership's business. The Managing General
Partner may delegate responsibility to those persons as a Majority in Interest
agree to compile and maintain all required information and prepare all required
materials provided for in this Agreement. Each Partner or his duly authorized
representative, upon five days' advance notice to the Managing General Partner,
may examine during normal business hours the books of the Partnership and all
other records and information concerning the operation of the Partnership.

      42. Reports. If requested by a Partner at least 30 days prior to the end
of a quarter, within 60 days after the end of each fiscal quarter in each fiscal
year of the Partnership, the Managing General Partner shall cause to be prepared
and sent to each Partner a balance sheet, income statement and cash flow
statement of the Partnership for and as of the end of that fiscal quarter, in
each case unaudited but accompanied by a report of the activities of the
Partnership for that quarter. Within 90 days after the end of each fiscal year
of the Partnership, the Managing General Partner shall cause to be prepared and
sent to each Partner a financial report consisting of (a) a balance sheet as of
the end of the fiscal year; (b) statements of income, partner's equity, and
changes in financial position for the fiscal year; (c) if requested by a
Partner, the opinion of the Partnership's certified public accountant concerning
the foregoing financial statements; (d) a summary of the Partnership's
activities for the fiscal year; (e) a statement showing the distributions to
each Partner during the fiscal year and identifying any distributions which
constitute a return of Capital Contribution; and (f) a statement showing the
amount of Taxable Income or Taxable Loss, and listing each item of income, gain,
loss, deduction, or credit allocated or charged against the Partner for federal
and state income tax purposes.

      43. Bank Accounts. The Managing General Partner shall maintain the bank
accounts of the Partnership in such financial institutions as the Managing
General Partner considers appropriate. The Managing General Partner shall make
or permit withdrawals from the Partnership's bank accounts on the signature of
the Managing General Partner or on such other signatures as the Partners shall
designate in writing.

      44. Tax Elections. If the Partnership has not made the election set froth
in Treas. Reg. ss. 1.761-2, or if Subchapter K of Chapter 1 of the Code applies
to the Partnership, the Partnership shall file an election under Section 754 of
the Code, relating to the optional adjustment to the basis of partnership
property, at the first time it is permitted to do so after the beginning of the
term of this Partnership. The Managing General Partner shall make or waive, at
its discretion, all other tax elections required or permitted to be made by the
Partnership under the Code.

      45. Accounting Method and Fiscal Year. The Managing General Partner shall
maintain the Partnership records and books of accounts in accordance with the
cash


                                       30
<PAGE>

method of accounting, with such modifications as are set forth in this
Agreement, and otherwise in accordance with genera11y accepted accounting
principles consistently applied. The fiscal year of the Partnership is the
calendar year.

                                   ARTICLE XI

                               GENERAL PROVISIONS

      46. Power of Attorney. Each Limited Partner (including each substitute
Limited Partner), by executing a counterpart of this Agreement, irrevocably
constitutes and appoints, with full power of substitution, the Managing General
Partner as his true and lawful attorney-in-fact, with full power and authority
in his name, place and stead to make, execute, acknowledge, deliver, swear to,
publish, record and file:

            (a) any certificate or other instrument that may be required to be
fi1ed, published or recorded by the Partnership under the Act or any other law
of Delaware or that the Managing Genera1 Partner considers advisable to file,
publish or record;

            (b) all documents (including schedules and amendments to this
Agreement) that may be required to effect the continuation or reinstatement of
the Partnership, admit an additional or substitute Partner (other than any
approval required of Limited Partners), reduce the Capital Contributions of a
Partner, or dissolve and terminate the Partnership; and

            (c) all amendments to this Agreement adopted in accordance with
section 54. The foregoing power of attorney is coupled with an interest,
resulting from each Limited Partner's reliance on the power of the
attorney-in-fact to act as contemplated by this Agreement for the purposes
described in this section 46. The foregoing power of attorney shall survive the
Retirement of a Limited Partner and the Assignment by any Limited Partner of all
or any part of his Partnership Interest, except that when an assignee is granted
Partnership Rights and admitted as a substitute Limited Partner the power of
Attorney of the assignor Limited Partner shall survive the Assignment only for
the purpose of enabling the non-managing General Partner to make, execute,
acknowledge, deliver, swear to, publish, record and file every instrument
necessary to effect the substitution.

      47. Partnership Contracts. The Managing General Partner may enter into
agreements and contracts on behalf of the Partnership only if they are in
writing and clearly indicate to the other parties that the Partnership is a
general partnership of which the Managing General Partner is a general partner.

      48. Conveyances. Subject to section 20, the Managing General Partner may
sign any deed, mortgage, lease, bill of sale, security agreement, pledge,
contract or other instrument or commitment purporting to convey or encumber any
of the Partnership's Property or any interest therein, whether now or
subsequently owned or leased at any


                                       31
<PAGE>

time by the Partnership, and no other signature is required.

      49. Notices. To be effective, a notice required or permitted by this
Agreement must be in writing, or by telegram, telex or telecopy if promptly
confirmed in writing. A notice is given when delivered or, if mailed, when
deposited in a United States postal service letterbox to be sent by first class,
postage prepaid, certified mail, with return receipt requested (whether or not
the sender receives the return receipt), and addressed, if to a Partner, at his
registered address listed on Exhibit A and, if to the Managing General Partner
or the Partnership, to the attention of such Managing General Partner at the
Partnership's principal business office.

      50. Consents. Any consent required by this Agreement may be given as
follows:

            (a) by a writing given by the consenting Partner and received by the
Managing General Partner or other appropriate recipient at or before the
occurrence of the action or other thing for which the consent was solicited,
unless the consent is nullified by:

                  (i) A writing from the consenting Partner that is received by
the Managing General Partner before the occurrence of the action or other thing
for which the consent was so1icited; or

                  (ii) the negative vote by the consenting Partner at any
meeting called for the purpose of considering the action or other thing.

            (b) by the affirmative vote of the consenting Partner at any meeting
called for the purpose of considering the action or other thing for which the
Partner's consent was solicited.

      51. Meetings. The Managing General Partner may call meetings of the
Partners for any purpose, at any, time. The Managing General Partner shall call
a meeting of the Partners within 30 days after he receives from a Majority in
Interest a written request for a meeting, stating the purpose of the requested
meeting and the matters proposed for consideration. Meetings of the Partners may
be held at such time, date and place as the Managing General Partner designates.
The Managing General Partner shall give notice of any meeting of the Partners
not less than ten nor more than 60 days before the date of the meeting, to each
Partner at his registered address listed on Exhibit A. The notice shall state
the time, date and place of the meeting, the purpose of the meeting and the
Partner at whose direction or request the meeting is called. Except in the case
of emergency, meetings of the Partnership shall be held in Delaware or South
Carolina. If a meeting is adjourned to another time or place, notice of the
adjourned meeting is not required if the time and place of the adjournment is
announced at the called meeting. The presence in person or by proxy of a
Majority in Interest constitutes a quorum at a meeting. Any notice of a meeting
required by this section may be waived in writing at, before or after the
meeting and shall be deemed to be waived by each Partner


                                       32
<PAGE>

who is present in person or by proxy at the meeting. Only those persons who are
Partners at the close of business on the day before the meeting are entitled to
vote at the meeting. Any Partner entitled to vote at a meeting may authorize any
person to act for him by written proxy if a copy of the proxy is delivered to
the Managing General Partner before the commencement of the meeting. To be
effective, a proxy must be signed by the Partner (and, if applicable, each
co-owner) or his duly appointed attorney-in-fact, and no proxy shall be valid
for more than 11 months after its date. A proxy is revocable at the pleasure of
the Partner granting it.

      52. Binding Effect; Counterparts. The covenants and agreements contained
in this Agreement are binding on, and inure to the benefit of, the legal and
personal representatives, heirs, successors and permitted assignees of the
parties to this Agreement. The parties may execute this Agreement in any number
of counterparts, each of which will be an original, but all of which together
will constitute one and the same agreement.

      53. Choice of Law. This Agreement and the rights and obligations of the
Partners under it are governed by, and construed and enforced in accordance
with, the laws of Delaware.

      54. Complete Agreement; Modification. This Agreement contains the final,
complete and exclusive expression of the understanding among the Partners with
respect to the Partnership and its purposes and objectives and supersedes any
prior or contemporaneous agreement or representation, oral or written, by any of
them. Except to admit a new or a substitute Partner or to reflect the withdrawal
or Retirement of a Partner, this Agreement and every provision of it may be
modified or amended only by an agreement in writing signed by or on behalf of
all Partners.

      55. Evidence of Partnership Interests. The Partnership Interest of each
Partner is evidenced exclusively by a counterpart of this Agreement (including
Exhibit A) that has been signed and dated by the Managing General Partner.

      56. Tax Matters Partner. The Managing General Partner or its designee
shall be the "tax matters partner" of the Partnership for federal income tax
purposes. Pursuant to Section 6223(c)(2) of the Code, upon receipt of notice
from the Internal Revenue Service of the beginning of an administrative
proceeding with respect to the Partnership, the Managing General Partner, as the
tax matters partner, shall furnish the Internal Revenue Service with the names,
addresses, and Percentage Interests of each of the Partners. The Managing
General Partner agrees not to enter into a settlement agreement pursuant to
Section 6224 of the Code without providing at least 30 days advance written
notice to each Partner. As tax matters partner, the Managing General Partner
shall have absolute discretion regarding whether to seek judicial review of any
administrative determination and, if it determines to seek judicial review of
Internal Revenue Service action pursuant to Section 6226 of the Code, then the
Managing General Partner shall select the judicial forum for such review. The
tax matters partner shall receive no compensation for its services as such. The
Partnership shall bear all third party costs and


                                       33
<PAGE>

expenses incurred by the tax matters partner in performing its duties as such.
Nothing herein shall be construed to restrict the Partnership from engaging an
accounting firm or law firm to assist the tax matters partner in discharging its
duties hereunder.

      57. Gender and Number. As used in this Agreement, the masculine gender
includes the feminine and neuter, and the singular includes the plural.

      58. Title. Title to any Property acquired by the Partnership shall be
taken in the name of the Partnership.

IN WITNESS WHEREOF, this agreement has been executed by or on behalf of each
Partner as of the date written beside his name.


                                GENERAL PARTNER:

                                /s/ Dennis J. McGillicuddy, Jr.   9/27/00
                                ------------------------------------------
                                Dennis J. McGillicuddy, Jr.        Date


                                LIMITED PARTNERS:

                                /s/ Dennis J. McGillicuddy        9/25/00
                                ------------------------------------------
                                Dennis J. McGillicuddy             Date


                                /s/ Graciela S. McGillicuddy      9/25/00
                                ------------------------------------------
                                Graciela S. McGillicuddy           Date


                                       34
<PAGE>

                              ADDENDUM NO. 1 TO THE
                        LIMITED PARTNERSHIP AGREEMENT OF
                MCGILLICUDDY INVESTMENTS LIMITED PARTNERSHIP III

      This is Addendum No. 1 (the "Addendum"), to the Limited Partnership
Agreement (the "Agreement") of McGillicuddy Investments Limited Partnership III,
a Delaware limited partnership the "Partnership"), entered into by and among
Dennis J. McGillicuddy Jr., as the Managing General Partner, and Dennis J.
McGillicuddy and Graciela S. McGillicuddy, as limited partners ("D. McGillicuddy
and G McGillicuddy," respective1y) effective as of August 1, 2000.

                                    ADDENDUM

      In addition to the Managing General Partner, the following individual is
authorized to make withdrawals from the Partnership's bank accounts:

            Ed Wood

      The parties hereto have executed this Addendum effective as of the date
and year stated above.

                            MANAGING GENERAL PARTNER

                            /s/ Dennis J. McGillicuddy Jr.
                            -------------------------------
                            Dennis J. McGillicuddy Jr.


                            LIMITED PARTNERS

                            /s/ Dennis J. McGillicuddy
                            -------------------------------
                            Dennis J. McGillicuddy


                            /s/ Graciela S. McGillicuddy
                            -------------------------------
                            Graciela S. McGillicuddy


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-3
<SEQUENCE>3
<FILENAME>ex-3.txt
<TEXT>

                                                                       Exhibit 3


                        AGREEMENT OF LIMITED PARTNERSHIP
                 OF THE McGILLICUDDY FAMILY LIMITED PARTNERSHIP

      AGREEMENT OF LIMITED PARTNERSHIP made as of the 18th day of December,
2001, among DENNIS J. McGILLICUDDY, as general partner (the "General Partner"),
and GEORGE J. CARTER, Trustee of the Dennis J. McGillicuddy, Jr. 2001 Trust,
which trust was created u/i/d December 18th, 2001 by and between Dennis
McGillicuddy, as Grantor, and George J. Carter, as Trustee, and McGILLICUDDY
INVESTMENTS LIMITED PARTNERSHIP, III, as limited partners (individually, a
"Limited Partner" and collectively, the "Limited Partners").

      WHEREAS, the parties hereto wish to enter into a limited partnership (the
"Partnership") with each other in accordance with the terms hereof to carry on
certain investment activities;

      NOW, THEREFORE, in consideration of the mutual agreements contained
herein, the parties agree as follows:

                                    ARTICLE I

                               GENERAL PROVISIONS

      1.01. Commencement. The Partnership shall, upon the terms and subject to
the conditions set forth herein, commence its existence subject to the
provisions of the Delaware Revised Uniform Limited Partnership Act (the "Act")
as of the date hereof.

      1.02. Duration. The Partnership will continue until December 31, 2060,
unless earlier dissolved and terminated as herein provided.

      1.03. Names, Status and Residences of Partners. The names, status and
places of residence of the General Partner and of the Limited Partners
(individually, a "Partner," and collectively, the "Partners") are set forth in
Schedule A attached hereto.
<PAGE>

      1.04. Filing and Publication of Certificate. The General Partner has
executed, acknowledged and filed or shall execute, acknowledge and file with the
office of the Secretary of State of the State of Delaware the requisite
certificates to comply with the provisions of the Act.

      1.05. Power of Attorney. The Limited Partners hereby constitute and
appoint the General Partner their true and lawful attorney to make, sign,
execute, certify, acknowledge and file on behalf of the Limited Partners (i) any
certificates of amendment or certificate of dissolution required under the Act
and to include therein all information required by law and (ii) any documents,
agreements and instruments necessary or related to the business and operation of
the Partnership.

      1.06. Purposes of Partnership. The purposes of the Partnership are to
purchase or otherwise acquire, hold for investment or sell or otherwise dispose
of or realize upon, and generally deal in all forms of securities including
limited partnership interests, stocks and bonds, real property and interests in
real property, and interests or participations in other property or assets of
any kind or description created or issued by any person, firm, partnership,
syndicate or other entity, to exercise as owner or holder of the foregoing all
rights, powers and privileges in respect thereof and to do all acts and things
necessary or appropriate for the preservation, protection, improvement and
enhancement in value of the foregoing. Without limiting the generality of the
foregoing, the Partnership may carry out its business and accomplish its
purposes as principal, whether by or through trustees or agents, alone or with
associates, or as a member of or as a participant in any firm, association,
trust, syndicate or other entity. The exercise of any powers pursuant to Article
II hereof shall be deemed consistent with the purposes of the Partnership.


                                       -2-
<PAGE>

      1.07. Name of Partnership. The name of the Partnership will be The
McGillicuddy Family Limited Partnership, or such other name as the General
Partner shall choose at any time.

      1.08. Principal Office. The principal place of business of the
Partnership, and such additional places of business of the Partnership as the
General Partner may from time to time desire to establish, shall be located at
such place or places inside or outside of the State of Delaware as the General
Partner may determine from time to time.

      1.09. Liability of General Partner. The General Partner shall be liable
far the repayment, satisfaction and discharge of all debts, liabilities and
obligations of the Partnership.

      1.10. Liability of Limited Partners. Subject to the provisions of the Act,
no Limited Partner shall be liable for the repayment, satisfaction and discharge
of all debts, liabilities and obligations of the Partnership in excess of the
balance of his, her or its respective Capital Account (as defined in Section
4.02 hereof).

      1.11. Additional Limited Partners. The General Partner may admit
additional Limited Partners to the Partnership, without the consent of any
Limited Partner. Admission of any partner hereunder shall not be a cause of
dissolution of the Partnership.

                                   ARTICLE II

                                     POWERS

      2.01. The Partnership shall have the following powers:

            (a) Investments. To invest and trade, on margin or otherwise, in
capital stock, bonds, notes, debentures, interests in limited partnerships,
mortgages including senior and junior mortgages and other instruments or
evidences


                                       -3-
<PAGE>

of indebtedness, in rights and options relating thereto and in real and personal
property (collectively, "Securities") and to sell Securities short;

            (b) Securities. To possess, transfer, mortgage, pledge or otherwise
deal in, and to exercise all rights, powers, privileges and other incidents of
ownership or possession with respect to, Securities held or owned by the
Partnership with the ultimate objective of the preservation, protection,
improvement and enhancement in value thereof;

            (c) Borrowing. To borrow or raise moneys and, from time to time
without limit as to amount, to issue, accept, endorse and execute promissory
notes, drafts, bills of exchange, warrants, bonds, debentures and other
negotiable or non-negotiable instruments and evidences of indebtedness, and to
secure the payment of any thereof and of the interest thereon by mortgage upon,
pledge of, or conveyance or assignment in trust of, the whole or any part of the
property of the Partnership, whether at the time owned or thereafter acquired,
and to sell, pledge, or otherwise dispose of such obligations of the Partnership
for its purposes;

            (d) Affiliates. To borrow moneys and/or securities from, and lend
moneys and/or securities to, relatives of Partners, corporations controlled by
Partners, trusts of which Partners are settlers, trustees or beneficiaries, and
any other person or entity affiliated with any of the Partners (collectively,
"Affiliates"), as well as Partners themselves, or to pledge, mortgage or
hypothecate securities to secure borrowings or other liabilities of Affiliates
to any financial institution, including any bank, and to make investments in or
otherwise be involved with respect to entities or ventures in which Partners or
Affiliates are involved; provided that it is expressly agreed and understood
that the General Partner shall be authorized to sign any documents on behalf of
the Partnership for this purpose without obtaining the prior consent of the
Limited Partners;


                                       -4-
<PAGE>

            (e) Offices. To have and maintain one or more offices within or
without the State of Delaware and in connection therewith to rent or acquire
office space, engage personnel and do such other acts and things as may be
necessary or advisable in connection with the maintenance of such office or
offices;

            (f) Bank Accounts. To open, maintain and close bank accounts,
including the power to draw checks or other orders for the payment of moneys;

            (g) Contracts. To enter into, make and perform all contracts,
agreements and other undertakings as may be necessary or advisable or incident
to the carrying out of the foregoing objects and purposes; and

            (h) Other. In general, to do and perform everything that may be
necessary or desirable for the conduct of the Partnership's business and to
carry out the purposes for which the Partnership is formed.

                                   ARTICLE III

                              CAPITAL CONTRIBUTIONS

      3.01. Contribution. Each Partner has agreed to contribute cash or
Securities having a value equal to the sum set forth opposite his, her or its
name on Schedule A hereof to the Partnership. The Partners shall make such
additional contributions as may from time to time be agreed upon by unanimous
consent of the Partners. With the consent of the General Partner, a Partner may
contribute Securities to the capital of the Partnership.

      3.02. Interest. The Partnership shall not be required to pay interest on
the capital contribution of any Partner.


                                       -5-
<PAGE>

                                   ARTICLE IV

                              CAPITAL ACCOUNTS AND
                           DIVISION OF PROFIT AND LOSS

      4.01. Partnership Books; Fiscal Year; Inspection. Proper and complete
books of account of the investment activities of the Partnership shall be kept
at the principal office of the Partnership. The fiscal year of the Partnership
will be the calendar year, provided, that the first taxable year of the
Partnership shall begin on the date hereof and end on December 31, 2001. As soon
as practicable after the end of each fiscal year, the General Partner shall
cause financial statements for such fiscal year to be prepared at the expense of
the Partnership. Except as may be otherwise required by law, the right of each
Limited Partner to inspect and copy the books of the Partnership shall be
limited to the portions of such books which deal with the interest in the
Partnership of such Limited Partner.

      4.02. Capital Accounts. Cumulative records reflecting the amount of a
Partner's capital contributions, distributions, gains, losses, expenses and
income ("Capital Accounts") will be maintained for each Partner.

      4.03. Allocation of Tax Items. Except as provided in Section 4.04 below,
income, gains, losses, deductions and credits of the Partnership (each as
determined for Federal income tax purposes) shall, for federal income tax
purposes, be allocated to the Partners proportionately in accordance with their
respective Capital Account balances. In the event that the Partners'
proportionate Capital Accounts vary during a fiscal year, appropriate
allocations shall be made by the General Partner.

      4.04. Gain or Loss on Contributed Securities. Any gain or loss realized
during any fiscal year by the Partnership from the sale of any contributed


                                       -6-
<PAGE>

Securities shall, for federal income tax purposes, be allocated between the
contributing Partner and all of the other Partners as follows:

            (a) Any such gain or loss attributable to the difference between the
      contributing Partner's adjusted basis for such Securities and the market
      value thereof at the time of their contribution shall be allocated to such
      contributing Partner; and

            (b) Any such gain or loss attributable to the difference between the
      market value of such Securities at the time of their contribution and the
      proceeds realized by the Partnerships shall be allocated among all of the
      Partners (including such contributing Partner) in proportion to their
      respective Capital Accounts.

      If operation of the "ceiling rule" set forth in the regulations under
Section 704 of the Internal Revenue Code of 1986, as amended (the "Code"),
prevents the preceding clause (a) from having its intended effect, appropriate
"curative allocations" shall be made by the General Partner.

      4.05. Valuation of Securities, For purposes of determining the value of
Securities, Securities which are traded on a stock exchange shall be valued at
their last sales prices on the date of determination, or, if no sales occurred
on such day, at the mean between the "bid" and "asked" price on such day;
Securities which are not so listed shall be valued at their last closing bid
prices if held "long" by the Partnership and their last closing asked prices on
the date of determination if held "short" by the Partnership; Securities which
are in the form of put or call options shall be valued at their last sales
prices; and Securities which are not readily marketable shall be valued at fair
market value as determined by the General Partner, in his sole discretion.


                                       -7-
<PAGE>

                                    ARTICLE V

                                   MANAGEMENT

      5.01. Control by General Partner. Except as otherwise limited herein, the
general management, control and conduct of the business of the Partnership will
be vested solely in the General Partner. The Limited Partners will not take any
part in the management of the business or transact any business for the
Partnership, and will have no power to sign for or bind the Partnership.

      5.02. Liability of General Partner. The General Partner shall not be
liable to the Limited Partners for any losses, damages or other injury incurred
in the conduct of partnership activities except those caused by the willful
neglect or gross negligence of the General Partner.

      5.03. Other Business Interests. The General Partner will devote such time
to the activities of the Partnership as he deems necessary for its operation. It
is understood, however, that the General Partner has and expects to have other
interests to which he intends to devote substantial amounts of time and from
which he expects to derive profits; and such other interests are expressly
permitted.

      5.04. Fees of General Partner. The Partnership shall not pay the General
Partner any fee as compensation for his services as General Partner to the
Partnership, but shall reimburse him for his out-of-pocket expenses. The
Partnership may retain and pay the fees and expenses of counsel, accountants and
other experts whether or not Affiliates of the General Partner.

      5.05. Tax Matters Partner. The General Partner shall be the Tax Matters
Partner as defined in Section 6231 (a)(7) of the Code.


                                       -8-
<PAGE>

                                      ARTICLE VI

                        LEGAL INTERESTS AND DISTRIBUTIONS

      6.01. Legal Interests. Each Partner shall have and own an undivided
interest in the Partnership equal to his, her or its Capital Account.

      6.02. Distributions. The General Partner shall make distributions of cash
and property at such times and in such amounts and shall maintain such reserves
as he shall, in his sole discretion, deem to be necessary or desirable.
Distributions shall be made to the Partners in proportion to their respective
Capital Account balances.

                                   ARTICLE VII

                        TRANSFER OF PARTNERSHIP INTEREST

      7.01. Prohibited Transfers. No Partner may, without the prior written
consent of the General Partner, transfer, sell, assign, pledge or otherwise
dispose of, whether voluntarily or by operation of law, at judicial sale or
otherwise, all or any portion of its, his or her interest in the Partnership to
any person or entity other than to the Partnership or to another Partner. Any
transfer of an interest in the Partnership, other than in accordance with this
Article, shall be voidable and the Partnership shall not be required to
recognize any equitable or other claims to such partnership interest on the part
of the purported transferee thereof. Any permitted transferee who is not already
a Partner shall become a Partner upon its, his, or her execution and delivery to
the Partnership of a copy of this Agreement, whereupon such permitted transferee
shall have the benefit, and shall be subject to the obligations, of this
Agreement.


                                      -9-
<PAGE>

                                  ARTICLE VIII

                          TERMINATION, DISSOLUTION AND
                            DISTRIBUTION OF PROCEEDS

      8.01. Election by General Partner. The Partnership may be terminated by
the General Partner as of the end of any fiscal year after fiscal year 2001 upon
at least ninety (90) days' prior written notice to each of the Partners. In such
event, the Partnership shall be wound up and liquidated.

      8.02. Death, Withdrawal, Etc. of Limited Partner. If any Limited Partner
dies or becomes incapable of acting as such, the Partnership shall not dissolve,
but the legal representative of such Limited Partner in his capacity as such
shall become the Limited Partner in lieu of the deceased or incapacitated
Limited Partner. A Limited Partner may withdraw from the Partnership only with
the prior written consent of the General Partner.

      8.03. Death, Withdrawal, Etc. of General Partner. The General Partner may
withdraw as such as of the end of any fiscal year upon at least thirty days'
prior written notice to each of the Partners. If the General Partner so
withdraws, or dies or becomes physically or mentally incapable of performing his
duties as the General Partner, or if all the legal interest of the General
Partner in the Partnership is sold, transferred, assigned or conveyed (whether
voluntarily or by operation of law), the interest of the General Partner shall
without further action be converted into an interest as Limited Partner. In the
event of the death, withdrawal or physical or mental incapacity or the sale,
transfer, assignment and conveyance of all the legal interest in the Partnership
of the General Partner, the Partnership shall terminate and shall be wound up
and liquidated, unless within ninety (90) days after the date of the death,
withdrawal or physical or mental incapacity or the sale, transfer, assignment


                                      -10-
<PAGE>

and conveyance of all the legal interest in the Partnership of the General
Partner, all the Limited Partners agree in writing to continue the business of
the Partnership and to the appointment of one or more General Partners to the
Partnership.

      8.04. Liquidation. A liquidation of the Partnership following its
termination and dissolution shall be carried out by the General Partner or, if
there is no General Partner, the Limited Partners may choose a liquidator. Such
liquidation may be completed either by selling the Partnership assets and
distributing the proceeds of such sale or by distributing the Partnership assets
to the Partners in kind as the person carrying out the liquidation shall
determine. Upon a distribution in kind each Partner shall receive an interest in
the Partnership assets subject to any unsatisfied Partnership liabilities.

      8.05. Payments Prior to Liquidating Distribution. Before any liquidating
distribution is made to the Partners, all Partnership debts and obligations (to
persons other than the Partners) shall be paid or provided for and reasonable
reserves shall be established for contingent liabilities in amounts determined
by the General Partner. Any obligations of the Partnership to Partners shall
then be paid. Thereafter the remaining Partnership assets shall be distributed
to the Partners in proportion to their Capital Account balances.


                                      -11-
<PAGE>

                                   ARTICLE IX

                               GENERAL PROVISIONS

      9.01. Election Under Section 754. Promptly upon receipt of notice from a
Partner or legal representative of a deceased Partner requesting the Partnership
to make an election under Section 754 of the Code (or any successor section) or
requesting revocation of such an election, the General Partner shall give notice
thereof to all other Partners, and, after considering any comments from the
other Partners, may in his discretion make an election or attempt to revoke any
election then in effect pursuant to such Section 754.

      9.02. Notices. All notices hereunder shall be in writing. Notices to a
Partner shall be directed to him, her or it at the address stated in Schedule A
hereto. Notices to the Partnership shall be directed to the attention of the
General Partner. Any Partner, by notice to the Partnership, may designate a new
address to which notices to him, her or it may be sent and the Partnership will
advise all of the Partners of such new address; similarly the Partnership may
designate a new address for notices to it, by written notice to all the
Partners. Unless otherwise specified herein, all notices shall be effective
either when delivered to the proper address or when sent by registered or
certified mail to such address.

      9.03. Indemnification. Notwithstanding the provisions of Section 1.09
hereof, the Partnership shall indemnify and save harmless the General Partner
from any personal loss, damage or liability incurred by him by reason of any act
performed by him or and on behalf of the Partnership except losses, damages and
liabilities incurred arising from the willful neglect or gross negligence of
such General Partner.

      9.04. Securities Law Restrictions. Each Partner by executing and
delivering this Agreement represents, warrants and covenants to the other
Partners


                                      -12-
<PAGE>

and the Partnership that his, her or its Partnership interest is being acquired
solely for his, her or its own account for investment and not with a view to any
public sale or other disposition thereof, and not for or on behalf of any other
person or entity and that such Partnership interest will not be sold without
registration under the Securities Act of 1933 or exemption therefrom.

      9.05. Arbitration. Any controversy or claim arising out of or relating to
this Agreement, or the breach thereof, shall be settled by the General Partner
and his determination shall be final, binding and conclusive. If and to the
extent that the foregoing provision shall be invalid or ineffective, any such
controversy or claim arising out of or relating to this Agreement or the breach
thereof shall be submitted to arbitration before a single arbitrator in Delaware
in accordance with the then prevailing Rules of Commercial Arbitration of the
American Arbitration Association and judgment upon any arbitration award may be
entered in any court having jurisdiction thereof.

      9.06. Further Assurances. Each Partner will do all acts and execute all
additional documents necessary or desirable to carry out the provisions of this
Agreement.

      9.07. Binding Effect. The rights and liabilities of the parties shall bind
and inure to the benefit of their respective heirs, administrators, executors,
successors and assigns.

      9.08. Survival. All the terms and conditions of this Agreement shall
survive the filing of the Limited Partnership Certificate and any other
certificates to be filed hereunder.

      9.09. Entire Agreement; Amendment. This Agreement constitutes the entire
agreement between the parties pertaining to the subject matter hereof and
supersedes all prior and contemporaneous agreements and understandings of the


                                      -13-
<PAGE>

parties in connection therewith. No Partner or agent of the Partnership is
authorized to make any representation, warranty or promise not contained herein.
No change, termination or attempted waiver of any of the provisions hereof shall
be binding on the Partnership unless in writing and signed by the General
Partner and a majority-in-interest of the Limited Partners (unless a higher
percentage is required by this Agreement or applicable law). No Partner or agent
of the Partnership is authorized to agree to any change, termination or waiver
of any of the provisions hereof in any other way. No modification, waiver,
termination, rescission, discharge or cancellation of this Agreement shall
affect the right of the Partnership to enforce any claim, whether or not
liquidated, which accrued prior to the date of such modification, waiver,
termination, rescission, discharge or cancellation of this Agreement, and no
waiver of any provision of or default under this Agreement shall affect the
right of the Partnership or Partners thereafter to enforce said provision or to
exercise any right or remedy in the event of any other default, whether or not
similar.

      9.10. Severability. Any term or provision of this Agreement which is
invalid or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such invalidity or enforceability without rendering
invalid or unenforceable the remaining terms and provisions of this Agreement or
affecting the validity or enforceability of any of the terms or provisions of
this Agreement in any other jurisdiction.

      9.11. Grammatical Construction. Whenever the context may require, any
pronouns used herein shall include the corresponding masculine, feminine or
neuter forms, and the singular form of nouns and pronouns shall include the
plural and vice versa.


                                      -14-
<PAGE>

      9.12. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, without regard to the
principles of conflicts of law thereof.

      9.13. Counterparts. This Agreement may be executed in separate
counterparts, each of which shall be deemed to be an original and all of which
shall be deemed to be one and the same instrument.

      9.14. Liability. The Trustee of the Dennis J. McGillicuddy, Jr. 2001 Trust
executes this Agreement only as Trustee and shall be bound hereby only in her
capacity as Trustee and not individually. The Partnership shall look solely to
the assets of the trust that is a Partner for satisfaction of any liability of
the Trustee of such trust in respect hereof


                                      -15-
<PAGE>

and will not seek recourse against such Trustee individually or against any of
his or her individual assets.

      IN WITNESS WHEREOF, the parties have executed this agreement as of the
date first set forth above.

                                GENERAL PARTNER:

                                /s/ Dennis J. McGillicuddy
                                --------------------------
                                Dennis J. McGillicuddy


                                LIMITED PARTNERS:


                                /s/ George J. Carter
                                --------------------------
                                George J. Carter, as Trustee of the Dennis J.
                                McGillicuddy, Jr. Trust created u/i/d December
                                18th, 2001, by and between Dennis J.
                                McGillicuddy, as Grantor, and George J. Carter,
                                as Trustee

                                McGillicuddy Investments Limited
                                Partnership, III

                                By: /s/ Dennis J. McGillicuddy
                                    --------------------------
                                    Dennis J. McGillicuddy
                                    Managing General Partner


                                      -16-
<PAGE>

STATE OF FLORIDA   )
                   :ss.:
COUNTY OF SARASOTA )

      On this 18th day of December, 2001, before me personally appeared DENNIS
J. McGILLICUDDY, to me known and known to me to be the individual described in
and who executed the foregoing instrument, and he duly acknowledged to me that
he executed the same.

[NOTARY SEAL]                       /s/ Marjory Schiavo
                                    -------------------------
                                    Notary Public


STATE OF MASSACHUSETTS  )
                        :ss.:
COUNTY OF MIDDLESEX     )

      On this 26 day of December, 2001, before me personally appeared GEORGE J.
CARTER, to me known and known to me to be the individual described in and who
executed the foregoing instrument, and he duly acknowledged to me that he
executed the same.

[NOTARY SEAL]                       /s/ Barbara J. Corinha
                                    -------------------------
                                    Notary Public

<PAGE>

STATE OF MASSACHUSETTS  )
                        :ss.:
COUNTY OF BARNSTABLE    )

      On this 18th day of December, 2001, before me personally appeared DENNIS
J. McGILLICUDDY, Jr., to me known and known to me to be the individual described
in and who executed the foregoing instrument, and he duly acknowledged to me
that he executed the same.

                                    /s/ [SIGNATURE ILLEGIBLE]
                                    -------------------------
                                    Notary Public


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4
<SEQUENCE>4
<FILENAME>ex-4.txt
<TEXT>

                                                                       Exhibit 4


                          LIMITED PARTNERSHIP AGREEMENT

                                       OF

                 SILVERSTEIN INVESTMENTS LIMITED PARTNERSHIP, II
                         a Delaware limited partnership
<PAGE>

                                    TABLE OF CONTENTS

                                                                        Page No.
                                                                        --------

ARTICLE I

                             FORM AND INTERPRETATION ......................  -5-
      Definitions .........................................................  -5-
      Captions and Certain Terms ..........................................  -5-
      Severability ........................................................  -9-
      Limitation of Grant .................................................  -9-

ARTICLE II

                           ORGANIZATION OF PARTNERSHIP ....................  -9-
      Formation, Name, Office and Registered Agent ........................  -9-
      Purpose of Partnership ..............................................  -9-
      Term of Partnership ................................................. -10-
      Authorized Acts ..................................................... -11-
      Co-Ownership of Partnership Interests ............................... -12-
      Representations and Warranties of the Limited Partners .............. -12-

ARTICLE III

                               PARTNERSHIP CAPITAL ........................ -14-
      Capital Contributions ............................................... -14-
      Capital Account ..................................................... -15-
      Expenses Paid by Partners ........................................... -16-
      Loans by Partners; Restrictions on Borrowing ........................ -16-

ARTICLE IV

             PROFITS AND LOSSES AND TAXABLE INCOME AND TAXABLE LOSS ....... -16-
      Allocations ......................................................... -16-

ARTICLE V

                       DISTRIBUTIONS, WITHDRAWALS AND LOANS ............... -18-
      Distributions ....................................................... -18-
      Limitation on Distributions to Partners ............................. -20-

ARTICLE VI

                 AUTHORITY, DUTIES, AND LIABILITIES OF PARTNERS ........... -20-
      Duties of Managing General Partner .................................. -20-
      Managing General Partner's Fees and Expenses ........................ -20-
      Authority of Managing General Partner ............................... -21-
      Special Limitation .................................................. -23-
      Dealing with Affiliates ............................................. -23-
<PAGE>

      Indemnification of General Partner .................................. -23-
      Liability of Limited Partners ....................................... -23-
      Authority of Limited Partners and Non-Managing General Partners ..... -24-

ARTICLE VII

                        TRANSFER OF PARTNERSHIP INTERESTS ................. -24-
      Limited Partners .................................................... -24-
      General Partner ..................................................... -24-
      Restriction on Transfer ............................................. -24-
      Admission of Substitute Partner ..................................... -25-
      Rights of Partner After Assignment and Substitution ................. -26-
      Allocations and Distributions After Assignment ...................... -26-

ARTICLE VIII

                  RETIREMENT, WITHDRAWAL OR REMOVAL OF PARTNERS ........... -26-
      Withdrawal of General Partner or Limited Partner .................... -26-
      Retirement, Removal, or Withdrawal of Managing General Partner ...... -27-
      Retirement of Limited Partner ....................................... -28-
      Rights of Partner After Retirement, Removal, or Withdrawal .......... -28-

ARTICLE IX

                                   DISSOLUTION ............................ -28-
      Events of Dissolution ............................................... -28-
      Winding-Up and Distributions ........................................ -28-
      Distribution of Liquidation Proceeds and Assets and Allocation
             of Gains and Losses .......................................... -29-
      Limitation of Liability of Partners ................................. -30-
      Waiver of Right of Partition of Assets .............................. -30-

ARTICLE X

                  ACCOUNTING YEAR, BOOKS, RECORDS, AND REPORTS ............ -30-
      Books and Records ................................................... -30-
      Reports ............................................................. -30-
      Bank Accounts ....................................................... -31-
      Tax Elections ....................................................... -31-
      Accounting Method and Fiscal Year ................................... -31-

ARTICLE XI

                               GENERAL PROVISIONS ......................... -31-
      Power of Attorney ................................................... -31-
      Partnership Contracts ............................................... -32-
      Conveyances ......................................................... -32-
      Notices ............................................................. -32-
<PAGE>

Consents .................................................................. -32-
Meetings .................................................................. -33-
Binding Effect; Counterparts .............................................. -33-
Choice of Law ............................................................. -34-
Complete Agreement; Modification .......................................... -34-
Evidence of Partnership Interests ......................................... -34-
Tax Matters Partner ....................................................... -34-
Gender and Number ......................................................... -34-
Title ..................................................................... -34-
<PAGE>

            SILVERSTEIN INVESTMENTS LIMITED PARTNERSHIP II AGREEMENT

      This Limited Partnership Agreement ("Agreement") is entered into, pursuant
to the provisions of the Delaware Uniform Limited Partnership Act, and shall be
retroactively effective as of the date of filing of the Certificate of Limited
Partnership with the Delaware Secretary of State, by S.B. Investment Management,
Inc. with Steven Blechner as its president, whose address is 40 Harvestwood
Drive, West, Bridgewater, MA 02379 (as the "Managing General Partner"). Barry
Silverstein, whose address is 5111 Ocean Boulevard, Suite C, Sarasota, Florida
34242 is the only limited partner in the Partnership. This Agreement is on the
following terms and conditions:

                                    ARTICLE I

                             FORM AND INTERPRETATION

      1. Definitions. The following capitalized terms, as used in this Agreement
and in the attached exhibits, which constitute a part of this Agreement, have
the meanings ascribed to them below and include the plural as well as the
singular number:

      "Act" means the Delaware law pertaining to Limited Partnerships, as
amended, or any subsequent Delaware law concerning partnerships that are enacted
in substitution for the Act.

      "Affiliate" of a Partner means (1) another Partner of the Partnership; (2)
a legal or personal representative of any Partner; (3) the Partner's lineal
descendants and spouse (other than a spouse who is legally separated from the
Partner under a decree of divorce or separate maintenance); (4) a trustee of a
trust for the benefit of any Person referred to in clause (1), (2) or (3); (5) a
Person, other than an individual, of which 80% or more of the voting or equity
interests is owned directly or indirectly by a Partner and/or one or more of the
Persons referred to in clauses (1) through (4); (6) a Person owning 80% or more
of the voting or equity interests of a Partner that is not an individual; or (7)
a Person other than an individual, 80% or more of the voting or equity interests
of which is owned by the same Person that owns 80% or more of the voting or
equity interests of a Partner that is not an individual.

         "Agreement" means this Limited Partnership Agreement as originally
executed and as subsequently amended or supplemented from time to time in
accordance with section 54.

      "Assignment" means a sale, exchange, gift, pledge, transfer or disposition
of any kind whatsoever and, in the case of a Person that is not an individual,
it includes the sale, exchange, pledge, transfer or disposition of a majority of
either voting control or the equity interests in such Person.
<PAGE>

      "Bankruptcy" means taking advantage of any bankruptcy or insolvency act
(including the Bankruptcy Reform Act of 1978 or similar law, and also any
proceeding under state or local insolvency or debtor relief laws), or a final
adjudication of insolvency or an assignment of a major portion of a Person's
assets for the benefit of creditors.

      "Capital Account" has the meaning set forth in section 12.

      "Capita1 Contribution" means the total amount of cash, and net fair market
value of securities and other property contributed by a Partner to the equity of
the Partnership, or agreed to be contributed by a Partner to the equity of the
Partnership, pursuant to section 11(a), and reduced by any return of capital to
the Partner within the meaning of section 11(c). Any reference in this Agreement
to the Capital Contribution of either a Partner or an assignee of a Partner
shall include the Capital Contribution of any prior Partner to whose Partnership
Interest the then existing Partner or assignee succeeded.

      "Cash Flow" means the excess of cash derived by the Partnership from all
sources, including from capital contributions, loans, sales of securities and
other activities, (but excluding cash derived from the winding-up and
liquidation of the Partnership pursuant to section 37) over the sum of all cash
disbursements, including repayments of loans from Partners, loans to Partners
for the Partnership, and distributions to Partners pursuant to section 16(a) or
(b) (but excluding disbursements pursuant to section 16(c), plus a reasonable
allowance for reserves for repairs, investments in Property (including
Marketable Securities), replacements, contingencies and anticipated obligations
(including debt service, capital improvements and replacements to the extent not
funded by reserves) as reasonably determined by the Managing General Partner.
Notwithstanding the preceding sentence, in determining the reasonable allowance
for reserves, the Managing General Partner shall reduce such allowance to the
extent necessary to ensure that annual distributions of Cash Flow to each
Partner will be in an amount at least equal to the annual income tax liability
(exclusive of income tax liability resulting from a transaction pursuant to
section 16(b) or (c)) of each such Partner (determined assuming that the maximum
possible income tax rate is applicable) resulting from the allocation to the
Partner of his share of the Partnership's Taxable Income and Taxable Loss. Cash
Flow is to be calculated separately for each Partner on the theory that each
Partner owns the assets of the Partnership contributed by such Person directly.
For this purpose, if a Partner has contributed Marketable Securities to the
Partnership, such Marketable Securities (including stock dividends thereon,
stock splits or other recapitalizations) shall be allocated to the contributing
Partner (or such Partner's assigns). In addition, Cash Flow shall be calculated
and distributed separately for each of the Class A Partnership Interest and the
Class B Partnership Interests and the assets of the Partnership allocated to
such interests.


                                       -6-
<PAGE>

      "Class A Partnership Interest" means an interest in the Partnership
represented by the Capital Account associated only with the Partnership's
ownership of those assets listed on Exhibit A-1 attached hereto and made a part
hereof (the "Class A Properties"), and the right to receive a percentage share
of the income, gain, loss, deduction, cash and other distributions and
liquidation proceeds associated with such property, all subject to and
interpreted in accordance with the terms of this Agreement. A Class A
Partnership Interest may be expressed in units with each unit representing
ownership of a one percent interest in the Class A Properties.

      "Class B Partnership Interest" means an interest in the Partnership
represented by a partner's Capital Account relating to all assets of the
Partnership other than those assets listed on Exhibit A-1 attached hereto and
made apart hereof, (i.e., excluding the Capital Account relating to the Class A
Properties), and the right to receive his percentage share of the income, gain,
loss, deduction, cash and other distributions and liquidation proceeds of the
Partnership (other than those associated with Class A Partnership Interests),
all subject to and interpreted in accordance with the terms of this Agreement.

      "Code" means the Internal Revenue Code of 1986, as amended, or any
subsequent federal law concerning income taxes that is enacted in substitution
for the Code.

      "General Partner" means any Person admitted as a general partner in
accordance with this agreement.

      "General Partnership Interest" means the Partnership Interest of a General
Partner, in his capacity as a General Partner.

      "Limited Partner" means any Person admitted as a limited partner in
accordance with this Agreement.

      "Limited Partnership Interest" means the Partnership Interest of a Limited
Partner, in the capacity as a Limited Partner.

      "Majority in Interest" when used in regard to the degree of consent,
approval or agreement required among the Partners, means Partners whose
aggregate Percentage Interests constitute over 50% of the total aggregate
Percentage Interests then outstanding.

      "Managing General Partner" means the Person designated in this Agreement
as the general partner responsible for management of the affairs of the
Partnership, including all voting rights with respect to, and control over,
Marketable Securities, and thereafter any Person which becomes a general partner
responsible for management of the affairs of the Partnership pursuant to this
Agreement, in the Person's capacity as a managing general partner of the
Partnership.


                                       -7-
<PAGE>

      "Marketable Securities" means securities, including stock, which are
traded on an established securities market, whether or not registered under the
Securities Act of 1933.

      "Partner" means each Person which is a Managing General Partner or a
Limited Partner.

      "Partnership" means the SILVERSTEIN INVESTMENTS LIMITED PARTNERSHIP II,
the limited partnership formed in accordance with the Act pursuant to this
Agreement.

      "Partnership Interest" includes only a Partner's Capital Contribution and
right to receive his Percentage Interest and excludes Partnership Rights.

      "Partnership Rights" excludes the Partnership Interest of a Partner, and
includes, in addition to other rights provided in this Agreement, the rights
provided to him by the Act except to the extent such rights are inconsistent
with the provisions of this Agreement.

      "Percentage Interest" shall mean a partner's percentage share from time to
time of the Net Profits and Net Losses, taxable income or taxable loss, Cash
Receipts, cash and other distributions and liquidation proceeds of the capital
of the Partnership attributable to a particular class of Partnership Interests
all subject to and interpreted in accordance with the terms of this Agreement.
The Percentage Interest of partners for each class of Partnership Interests
shall be proportionate to the Capital Accounts of the partners in that class of
Partnership Interest at all times so that, for example, if a Partner's Capital
Account in one class is 100 and the aggregate of all Capital Accounts in the
same class of Partnership Interest is 1000, the partner's Percentage in that
class of the Partnership is 10%. Except as otherwise provided in this Agreement,
in the event of a change among the partners in the Percentage Interest in the
Partnership during the year, the Partnership shall use a closing-of-the-books
method with respect to such change or changes in Percentage Interest in
computing a partner's share of profits and losses, taxable income and taxable
losses, and entitlement to distributions during such year.

      "Person" means any individual and any general or limited partnership,
corporation, estate, joint venture, trust, business trust, cooperative,
association or other organization.

      "Profits and Losses" means the annual net income or loss of the
Partnership determined on a generally accepted accounting principles basis, as
disclosed on the annual financial statements of the Partnership, except that
Profits and Losses shall be computed separately for each of the Class A
Partnership Interests and Class B Partnership Interests. If the Partners have
elected for the Partnership to be excluded


                                       -8-
<PAGE>

from the application of Subchapter K of Chapter 1 of the Code, the provisions
relating to Profits and Losses shall be of no effect during such period at the
Partnership level, but will be separately computed for each Partner.

      "Property" means any real, personal, tangible or intangible property
contributed by a Partner to the equity of the Partnership or otherwise acquired
by the Partnership.

      "Pro Rata" means in the proportion that the Percentage Interest of each
Partner bears to the total Percentage Interests of all the Partners.

      "Retirement" means the death, Bankruptcy, adjudication of incompetency as
determined by a court of appropriate jurisdiction, dissolution and liquidation
or termination of existence, merger or consolidation (except as provided in
sections 33 and 34) of a Partner, or the sale, lease or other disposition of all
or substantially all the property of a Partner (except as provided in sections
33 and 34).

      "Taxable Income or Taxable Loss" means the net income or loss of the
Partnership for federal income tax purposes, as determined at the close of the
Partnership's fiscal year by the accountants employed by the Partnership to
prepare its income tax returns. If the Partners have elected for the Partnership
to be excluded from the application of Subchapter K of Chapter 1 of the Code,
the provision shall be of no effect for federal income tax purposes during such
period, but will be separately computed for each Partner.

      2. Captions and Certain Terms. The titles and captions preceding the text
of the articles and sections of this Agreement are solely for convenience of
reference and neither constitute a part of this Agreement nor affect its
meaning, interpretation, or effect. The words "hereby," "herein," "hereof,"
"hereto," "hereunder," and terms of similar import refer to this Agreement as a
whole and not to any particular article, section, subsection or other part of
this Agreement.

      3. Severability. If any article, section or other provision of this
Agreement, or its application, is held to be invalid, illegal or unenforceable
in any respect or for any reason, the remainder of this Agreement and the
application of such article, section or other provision to a person or
circumstance with respect to which it is valid, legal and enforceable is not
affected.

      4. Limitation of Grant. Nothing in this Agreement, whether express or
implied, is intended or may be construed to confer upon, or to grant to, any
creditor or any other Person (other than the Partners and their legal and
personal representatives, heirs, successors and permitted assignees) any right,
remedy or claim under or because of this Agreement or any covenant, condition or
stipulation of it.


                                       -9-
<PAGE>

                                   ARTICLE II

                           ORGANIZATION OF PARTNERSHIP

      5. A. Formation, Name, Office and Registered Agent. The Partnership was
organized as of the effective date of this Agreement and the signatories to this
Agreement constitute the members of this Partnership under the Act as of such
date and as of the date hereof. The rights and obligations of the Partners are
determined by the Act, except as otherwise expressly provided in this Agreement.
The name of the Partnership is "SILVERSTEIN INVESTMENTS LIMITED PARTNERSHIP
II." The record keeping office of the Partnership and its principal place of
business are located at the residence of the Managing General Partner where the
Managing General Partner performs administrative services on behalf of the
Partnership. The Partnership does not have a principal business office. The
Managing General Partner may change the name of the Partnership or may designate
the location of its principal business office at any time and from time to time
by giving written notice of such change to each Partner. The registered agent
and registered office of the Partnership is The Corporation Trust Company, 1209
Orange Street, Wilmington, DE 19801.

            B. General and Limited Partners. S. B. Investment Management, Inc.
with Steven Blechner as its President is the initial Managing General Partner of
the Partnership. The initial Limited Partner of the Partnership is Barry
Silverstein.

            C. Certificate of Limited Partnership. In connection with the
execution of this Agreement, the Managing General Partner signed a certificate
of limited partnership, pursuant to the Act. The Managing General Partner shall
cause the certificate to be filed with the Delaware Secretary of State. The
certificate also has been amended to implement the change in General Partners.
The Managing General Partner shall amend the certificate when required under
this Agreement and shall execute the amended certificate as required by the Act.

      6. Purpose of Partnership.

            (a)   Except as provided in 6(c) below, the purposes of the
                  Partnership are to:

                  (i)   invest in, own, sell, acquire, manage and exercise the
                        voting rights associated with Marketable Securities,

                  (ii)  after approval by a Majority in Interest, acquire, hold,
                        sell, own, improve, develop or lease other types of
                        property in addition to Marketable Securities, and


                                      -10-
<PAGE>

                  (i)   engage in any other lawful activity for profit approved
                        by an affirmative vote of a Majority in Interest.

      (b)   Notwithstanding Section 6(a), unless unanimously approved by the
            Partners, the Partnership shall not engage in any activity(ies)
            which would result, based upon opinion of tax counsel, in the
            characterization of the Partnership as an investment company as that
            term is used in Section 721(b) or any successor provision of the
            Code.

      (c)   Subsequent to the date of commencement of existence of the
            Partnership, the Partners may make the election set forth in Treas.
            Reg. ss. 1.761-2 to have the Partnership excluded from the
            application of Subchapter K of Chapter 1 of the Code until such time
            as a Majority in Interest determine to have the Partnership engage
            in an activity other than investing in Marketable Securities and
            other intangible assets. Until such time as the Partnership engages
            in other than investment activities, and if the aforementioned
            election is made, it is the intention of the Partners that the
            Partnership shall be only for investment purposes and shall not
            actively conduct business. It is the intention of the Partners that
            the Partnership shall have legal title to, and ownership of,
            Marketable Securities so as to effectuate the co-ownership of the
            Marketable Securities by the Partners. As is evidenced by various
            provisions of this Agreement, each Partner reserves the right
            separately to take or dispose of their shares or interests in the
            Marketable Securities and the other assets contributed by such
            Partner to the Partnership. Further, during the period Subchapter K
            does not apply to the Partnership, this Agreement is to be
            interpreted in a manner that will give effect to such election.

      7. Term of Partnership. The term of the Partnership shall continue until
the earlier of (i) December 31, 2020, or (ii) the death or adjudication of
incompetency as determined by a court of appropriate jurisdiction of Barry
Silverstein, unless the Partnership is earlier dissolved and terminated under
this Agreement.

      8. Authorized Acts. In furtherance of its purposes, but subject to every
other provision of this Agreement, the Partnership, through, and only through,
the actions of the Managing General Partner acting alone, is authorized to do
the following:


                                      -11-
<PAGE>

            (a) acquire by purchase, lease or otherwise, any real or personal,
tangible or intangible property that may be necessary, convenient or incidental
to the accomplishment of the purposes of the Partnership;

            (b) construct, operate, maintain, finance, improve, own, sell,
convey, exchange, assign, mortgage or lease any property (or a part thereof) as
may be necessary, convenient or incidental to the accomplishment of the
purposes of the Partnership;

            (c) borrow money and issue evidences of indebtedness in furtherance
of any purpose of the Partnership and secure the same by a mortgage, pledge,
security interest or other liens on the property, any part thereof, any interest
therein or on any improvements thereto;

            (d) prepay, in whole or in part, refinance, increase, renew, modify
or extend any indebtedness of the Partnership and, in connection therewith,
extend, renew or modify any mortgage, pledge, security interest or other lien
affecting any property;

            (e) invest and reinvest the assets of the Partnership in, and
purchase, acquire, hold, sell, transfer and exchange securities of all kinds,
including Marketable Securities;

            (f) lend money to Partners;

            (g) exercise the voting rights associated with property owned by the
Partnership; and

            (h) enter into any activity and perform and carry out any contract
in connection with, or necessary or incidental to, the accomplishment of the
purposes of the Partnership.

      9. Co-Ownership of Partnership Interests. Any consent required by a
Partner shall require the action or vote of each Person (or in such other manner
as such Persons have designated in writing to the Partnership) having an
interest in such Partnership Interest, with a majority approval needed for
consent. On the death of a co-owner of a Partnership Interest held in either
joint tenancy with right of survivorship or tenancy by the entirety, the
Partnership Interest is owned solely by the survivor as a Partner, and not as an
assignee. The Partnership need not (although it may) recognize the death of a
co-owner of a Partnership Interest until the Managing General Partner receives
notice of the death. A co-owner of a Partnership Interest may sever the tenancy
by giving to the Managing General Partner notice to that effect, and signed by
the co-owner requesting the severance in the case of a joint tenancy, and by
both co-owners in the case of a tenancy by the entirety. Upon receipt of the
notice and


                                      -12-
<PAGE>

the certificate evidencing the Partnership Interest owned by the co-owners, the
Managing General Partner shall cause the Partnership Interest to be allocated as
directed by the co-owners and shall indicate on the Partnership records such
allocation. In absence of joint direction, the interests shall be allocated
between the owners as the severed ownership interests would be valued for
federal estate tax purposes.

      10. Representations and Warranties of the Limited Partners. As a condition
to becoming a Limited Partner of the Partnership, each Limited Partner
represents, warrants, and covenants to each General Partner and the Partnership
as follows:

            (a) He will not assign, sell, mortgage, pledge, or otherwise
transfer or encumber any of his rights under this Agreement except as expressly
permitted under this Agreement and applicable laws;

            (b) He was granted full and unrestricted access to the Partnership's
business premises, offices and properties and its business, partnership and
financial books and records as he required, and was permitted to examine the
foregoing, to question the General Partner, and to make all other investigations
that he considered appropriate to determine or verify the business or condition
(financial or otherwise) of the Partnership and to consummate the transactions
contemplated by this Agreement;

            (c) The Partnership furnished him all additional information
concerning the Partnership's business and affairs that he requested;

            (d) He was permitted to ask questions of, and to receive answers
from, the General Partner concerning the terms and conditions of an investment
in a Limited Partnership Interest, and to obtain all additional information he
considered necessary to verify the accuracy of the information received by him
from the General Partner, and he understands the risks associated with an
investment in the Partnership and that such an investment is highly speculative;

            (e) Because of his considerable knowledge and experience in
financial and business matters in general and securities investments in
particular, he is able to evaluate the merits, risks, and other factors bearing
on the suitability of a Limited Partnership Interest as an investment;

            (f) His income and net worth are such that he is not now, and does
not contemplate being, required to dispose of any investment in the Partnership
to satisfy any existing or expected obligation, and he is otherwise fully able
to bear the economic risks of his proposed investment in the Partnership,
including the risk of losing all or any part of his investment in the
Partnership and the probable inability to sell, transfer, or pledge, or
otherwise dispose of an investment in the Partnership for an indefinite period;


                                      -13-
<PAGE>

            (g) He is acquiring a Limited Partnership Interest solely for his
own account, as principal, for investment purposes and not with a view to or for
resale in connection with any distribution or underwriting of any Partnership
Interests;

            (h) He understands that the Limited Partnership Interest that he
will purchase has not been and will not be registered under either the
Securities Act of 1933 or any state securities law, that he must hold the
Limited Partnership Interest indefinitely unless the Partnership Interests are
subsequently registered under those laws or transferred in reliance on advice of
counsel satisfactory to the Partnership that registration under those laws is
not required, and that stop-transfer instructions will be noted in the
appropriate records of the Partnership;

            (i) He understands that the document evidencing a Limited
Partnership Interest acquired by him will bear the following legend:

      These securities have not been registered under either the Securities Act
      of 1933 or any state securities law and were acquired pursuant to an
      investment representation by the record owner. These securities are not
      transferable absent either registration under the Act and every applicable
      state securities law or advice of counsel satisfactory to the Partnership
      that registration in not required. Additionally, these securities are
      subject to certain transfer restrictions set forth in the Limited
      Partnership Agreement of the Partnership. Reference may be made to the
      Limited Partnership Agreement for the details of those restrictions.

            (j) He understands that a legend substantially identical to the one
described above will be placed on every new document issued upon a transfer of a
Limited Partnership Interest;

            (k) He shall not sell, transfer, pledge, or otherwise dispose of any
part of his Limited Partnership Interest, unless the Partnership Interests are
registered under the Securities Act of 1933 and under every applicable state
securities law or unless the Partnership is furnished with advice of counsel
satisfactory to it that registration under those laws is not required; and

            (l) He understands that the Partnership does not file periodic
reports with the Securities and Exchange Commission pursuant to the Securities
Exchange Act of 1934.


                                      -14-
<PAGE>

                                   ARTICLE III

                               PARTNERSHIP CAPITAL

      11. Capital Contributions.

            (a) Upon executing this Agreement, each Partner shall make or has
made a Capital Contribution in the amount and of the type, and initially shall
have a Percentage Interest equal to the percentage, set forth opposite his name
on Exhibit A. Partners may make (but Limited Partners are not required to make)
additional Capital Contributions at such time and in such amount as they in
their sole discretion shall determine but only if the Managing General Partner
and a Majority in Interest consent to such additional Capital Contributions.
Upon the assignment of any Partnership Interest, the making of an additional
Capital Contribution or any return of a Capital Contribution, or any
substitution of a Partner, Exhibit A shall be amended to accurately reflect the
name, address, Capital Contribution and Percentage Interest of each Partner.
Each Parties will also be assigned either or both as Class A and Class B
Partnership Interest depending on the assets contributed by each Partner and as
they shall mutually agree at the time of contribution.

            (b) Notwithstanding (a) above, no Capital Contributions shall be
made or permitted by any Partner which would result, directly or indirectly, in
the Partnership being treated as an investment company under section 721(b) of
the Code, and any such attempted Capital Contribution shall be void ab initio.
The Managing General Partner shall withhold its consent to the making of an
additional Capital Contribution, unless it has satisfied itself (by seeking
advice of legal counsel or otherwise) that the making of the additional Capital
Contribution will not result, directly or indirectly, in the Partnership being
treated as an investment company under section 721(b) of the Code.

            (c) A Partner shall not receive from the Managing General Partner or
out of Partnership Property, and the Managing General Partner and the
Partnership shall not return to a Partner, any part of his Capital Contribution,
except as set forth in Articles V, VIII and IX of this Agreement and such
distribution is determined to be a return of a Partner's Capital Contribution,
and then only if all liabilities of the Partnership, except liabilities to the
Partners on account of their Capital Contributions, have been paid or there
remains property of the Partnership sufficient to pay them. The Partnership
shall not pay interest on Capital Contributions, and, a Partner may demand and
receive only cash in return for his Capital Contribution, except to the extent
provided for in Articles V and IX of this Agreement or unless the Liquidator (as
defined in section 37) decides to distribute Partnership property in kind upon
the dissolution, winding-up, and termination of the Partnership, or unless the
distribution of property to a Partner is unanimous1y approved by the Partners.
Each Partner, by signing this Agreement or a counterpart


                                      -15-
<PAGE>

of it, consents to all distributions authorized by this Agreement and releases
all other Partners from all liability to both him and the Partnership for all
distributions made in accordance with this Agreement.

      12. Capital Account

            (a) The Managing General Partner shall establish and maintain a
Capital Account for each Partner in the Partnership's books of account. Capital
Accounts shall be maintained and adjusted in accordance with generally accepted
accounting principles. A Limited Partner shall not be obligated to restore a
deficit balance in its Capital Account, except to the extent required by the
Act. Consistent with these capital account maintenance rules, the Managing
General Partner shall credit to each Partner's Capital Account the amounts of
the Partner's Capital Contributions and any Profits allocated to the Partner.
The Managing General Partner shall charge to or deduct from each Partner's
Capital Account the amounts of all distributions (in cash or other property) or
the Partner and any Losses allocated to the Partner. If any interest in the
Partnership is transferred in accordance with the terms of this Agreement, the
transferee shall succeed to the Capital Account of the transferror to the extent
it relates to the transferred interest.

            (b) The provisions of this section and the other provisions of this
Agreement pertaining to the maintenance of Capital Accounts are intended to
comply with Treasury Regulation Section 1.704-1(b) (or any successor provision
thereto), and shall be interpreted and applied in a manner consistent with such
Regulations. In the event that Managing General Partner determines that it is
prudent to modify the manner in which the Capital Accounts are computed in order
to comply with such Regulations, provided that it is not likely to have a
material effect on the amounts distributable to any Partner without such
Partner's consent and upon receipt of an opinion of tax counsel to the
Partnership concluding that such modification will be given effect for federal
income tax purposes, the Managing General Partner may make such modification.

            (c) The Managing General Partner shall revalue the Partnership's
Property (based on its fair market value as of the moment immediately preceding
the relevant event) and shall adjust Capital Accounts to take into account any
resulting Profit or Loss (determined as if the Partnership sold all its Property
for cash equal to the Property's fair market value) upon the occurrence of
either of the following events: (1) the making by any Partner of any non-Pro
Rata additional Capital Contribution, (2) the partial or complete withdrawal of
a Partner's Partnership Interest, or (3) the admission of a Partner.

            (d) For the purposes of determining Percentage Interests, making
allocations and distributions pursuant to Articles IV and V, and wherever else
relevant in this Agreement, multiple Capital Accounts shall be maintained for
each partner who


                                      -16-
<PAGE>

owns more than one class of Partnership Interest. A combined Capital Account
shall also be maintained for each partner who has more than one class of
Partnership Interest. The combined Capital Account shall be relevant for
determining the total amount of distributions to a partner in the event of the
liquidation of the Partnership. In the event that a Partner with more than one
class of Partnership Interest has a positive combined Capital Account balance at
the time of the liquidation of the Partnership, but has a deficit in one of the
separate Capital Accounts, liquidating distributions shall be made only to the
extent of the net positive balance.

      13. Expenses Paid by Partners. Any Partnership expense reasonably paid by
any Partner on behalf of the Partnership is an indebtedness of the Partnership
to the Partner and does not increase the Partner's Partnership Interest or
Percentage Interest. The Partnership shall reimburse the Partner as soon as
practicable and may pay interest on the indebtedness.

      14. Loans by Partners; Restrictions on Borrowing. The Managing General
Partner may borrow money on behalf of the Partnership from any Partner in such
amounts and for such purposes as it considers necessary, convenient or
incidental to the accomplishment of the purposes of the Partnership. Each loan
to the Partnership by a Partner (excluding reimbursable expenses) shall be
evidenced by a promissory note or similar instrument of the Partnership, may be
secured by a lien on the Property, may bear interest at a rate determined by
agreement between such Partner and the Managing General Partner and may be
subject to such other terms and conditions as are agreed to by such Partner and
the Managing General Partner. The Partnership may prepay each loan from a
Partner in whole or in part, at any time and from time to time, without premium
or penalty. The Managing General Partner may not borrow money from persons other
than Partners or pledge Partnership assets without the express written consent
of the non-managing general partner.

                                   ARTICLE IV

             PROFITS AND LOSSES AND TAXABLE INCOME AND TAXABLE LOSS

      15. Allocations.

            (a) Allocation of Profits and Losses.

                  (i) Profits and Losses of the Partnership shall be determined
for each fiscal year of the Partnership in accordance with the cash method of
accounting, with such exceptions thereto as are set forth in this Agreement, and
otherwise in accordance with generally accepted accounting principles applied in
a consistent manner.


                                      -17-
<PAGE>

                  (ii) Except as otherwise provided, the Partnership's Losses,
if any, arising in a fiscal year shall be allocated among the Partners as
follows:

                        (1) FIRST: To the extent of the aggregate positive
Capital Account balances of the Partners as of the end of the fiscal year, Pro
Rata to the Partners taking into account any changes in Partnership Percentage
Interests during the fiscal year.

                        (2) SECOND: Pro Rata, to the Managing General Partner.

                  (iii) Profits arising in a fiscal year shall be allocated
among the Partners as follows:

                        (1) FIRST: To the General Partner until Profits
allocated to the General Partner during the term of the Partnership pursuant to
this Section 15(a)(ii)(1) equal Losses allocated to the General Partner during
the term of the Partnership pursuant to Section 15(a)(ii)(2) then

                        (2) SECOND: To the Partners Pro Rata taking into account
any changes in Partnership Percentage Interests during the fiscal year.

            (b) Allocation of Taxable Income and Taxable Loss.

                  (i) Except as otherwise provided in this section l5(b),
allocations of tax items among the Partners shall be consistent with
corresponding book (Profits and Losses) items (if any). For tax purposes,
Profits and Losses, or any item thereof, shall be appropriately adjusted to
reflect Taxable Income and Taxable Loss, or any item thereof, as determined
under the Code and shall be allocated among the Partners in such a manner as to
comply with the provisions of the Code and Regulations thereunder (including, if
necessary, the "minimum gain chargeback provisions" of the Regulations under
Section 704 of the Code). For example, any gain or loss recognized by the
Partnership with respect to property contributed to the Partnership by a Partner
shall be shared among the Partners so as to take account of the variation, if
any, between the basis of the property to the Partnership and its fair market
value at the time of contribution or revaluation, whichever is applicable, so as
to comply with the requirements of Section 704 of the Code. Thus, for example,
if a Partner contributes Property to the Partnership whose agreed fair market
value exceeds its adjusted basis in the hands of the contributing Partner
("built-in gain"), and there have been no events giving rise to a revaluation,
built-in gain with respect to such contributed Property shall first be allocated
to such contributing Partner when the Partnership recognizes gain upon a
disposition of such contributed Property, but not in an amount in excess of such
built-in gain; the remaining balance of such recognized gain, if any, shall be
allocated among the Partners as set forth herein. The allocation of built-in
gain to a contributing Partner shall not increase such Partner's Capital


                                      -18-
<PAGE>

Account, because such gain was already taken into account when the built-in gain
property was contributed to the Partnership. A Partner who contributes property
other than cash shall provide the Managing General Partner with information
necessary to verify the contributing Partner's adjusted tax basis in the items
of property contributed by him to the Partnership.

                  (ii) Generally, except as provided in section l5(b)(i),
Taxable Income and Taxable Loss (and each such income and loss item) shall be
allocated Pro Rata among the Partners. In the event, however, that non-Pro Rata
distributions of property are made to a Partner or the net proceeds from the
sale of property are distributed non-Pro Rata to a Partner, Taxable Income and
Taxable Loss derived from such distributions or sales shall be allocated 100% to
such Partner, subject only to such modifications as are necessary to comply with
Section 704 of the Code. In addition, no allocations of Taxable Loss shall be
made to a Limited Partner that would create a deficit balance in the Limited
Partner's Capital Account.

                                    ARTICLE V

                      DISTRIBUTIONS, WITHDRAWALS AND LOANS

      16. Distributions.

            (a) Cash Flow Distributions. Cash Flow is to be distributed
periodically as the Managing General Partner shall determine.

            (b) Partial or Complete Withdrawal by a Partner From the
Partnership.

                  (i) In the event of a partial or complete withdrawal of a
Partner from the Partnership pursuant to Article VIII, the Managing General
Partner shall, as promptly as is reasonably possible, distribute to the Partner
any assets then owned by the Partnership that were previously contributed by
such Partner to the Partnership but this distribution shall be limited to the
extent it would cause the Capital Account of such Partner to be negative. If the
Partner has a positive Capital Account balance, then the Partnership shall
distribute to the Partner his Pro Rata share of the Marketable Securities, cash
and other readily divisible assets of the Partnership. The withdrawing Partner
shall also be entitled to receive cash equal in value to his Pro Rata share of
the fair market value (as reasonably determined by the Managing General Partner)
of any non-readily divisible assets owned by the Partnership. The Managing
General Partner shall, as promptly as possible, distribute this additional
amount of cash, if any, to the withdrawing Partner. Cash distributions to the
withdrawing Partner shall be reduced by such Partner's Pro Rata share of the


                                      -19-
<PAGE>

liabilities of the Partnership and by any expenses incurred by the Partnership
with respect to the withdrawal of the Partner.

                  (ii) A Partner may request that all or a portion of the
Marketable Securities subject to the requested withdrawal be sold by the
Partnership and the net proceeds (after selling and other expenses) distributed
as directed by him. In the event that the Managing General Partner is unable or
unwilling to sell these Marketable Securities, it shall distribute them to the
Partner, unless it is notified by the Partner to cancel the withdrawal.

                  (iii) The Managing General Partner shall not be required to
distribute to the requesting Partner any assets that the Partnership is legally
restricted or prohibited from distributing to the Partner, unless steps can be
taken to remove the restriction or prohibition; in which case the requesting
Partner shall be charged with the expense of removing such restriction or
prohibition. Any distribution hereunder shall also be subject to the limitations
set forth in sections 11(c) and 17, respectively.

            (c) Liquidating Distributions. The net proceeds from liquidation of
the Partnership's assets pursuant to its dissolution, winding-up, and
termination shall be distributed, and all Profits and Losses resulting from the
liquidation of the Partnership Property shall be allocated, among the Partners
in the proportions and orders of priority specified in this section 16(c).

                  (i) The Liquidator shall distribute the net proceeds from
liquidation of the Partnership's assets as follows:

                        (1) FIRST: To pay all the liabilities of the Partnership
that are then due and payable, except for both Capital Contributions of Partners
and liabilities to the Partners, in the order of priority required by Delaware
law; then

                        (2) SECOND: To establish any reasonable reserve that the
Liquidator may determine is required for unpaid, future, or contingent
liabilities or obligations of the Partnership; then

                        (3) THIRD: To pay all liabilities of the Partnership to
the Partners; Pro Rata according to the amounts of their respective liabilities;
then

                        (4) FOURTH: To the Partners to the extent of any
positive balances in their Capital Accounts, Pro Rata according to the amounts
of their respective positive balances; then

                        (5) FIFTH: Any remaining net proceeds shall be
distributed Pro Rata among the Partners.


                                      -20-
<PAGE>

                  (ii) Any Profits and Losses and Taxable Income and Taxable
Loss resulting from the disposition of the Partnership's assets in the process
of liquidation shall be allocated among the Partners in the manner provided in
section l5. Any Property distributed in kind in the liquidation shall be valued
and treated as if the Property were sold and the cash proceeds were distributed.
The Profits and Losses arising from the constructive sale of the Property
described in the preceding sentence shall be allocated among the Partners in the
manner provided in section 15.

      17. Limitation on Distributions to Partners. A Partner may receive
distributions from the Partnership only to the extent the Partnership's total
assets exceed its total liabilities, other than liabilities to the Partners on
account of their Capital Contributions.

                                   ARTICLE VI

                 AUTHORITY, DUTIES, AND LIABILITIES OF PARTNERS

      18. Duties of Managing General Partner. The Managing General Partner, and
no other Partners, shall manage the affairs of the Partnership, shall apply
himself diligently for the Partnership, and shall devote to the Partnership such
time as is necessary and appropriate to manage the business of the Partnership.
The Managing General Partner is not required to devote all its business time to
the Partnership, and it may engage in other business ventures and employment,
including those in competition with the Partnership. In the performance of its
duties, the Managing General Partner may hire employees and agents of the
Partnership and generally shall supervise and direct all the daily operations of
the Partnership.

      19. Managing General Partner's Fees and Expenses.

            (a) Fees to Managing General Partner. In consideration for
performing services described herein, the Managing General Partner may be paid a
fee as agreed to by a Majority in Interest. Such fees shall be deemed earned
when the services have been performed and, regardless of when paid, shall be
non-executory from the date earned and shall be the obligation of the
Partnership from and after that date.

            (b) Expenses. Except as otherwise provided herein, the Partnership
shall pay all expenses of the Partnership (which expenses may be either billed
directly to the Partnership or reimbursed to the Managing General Partner) which
may include, but are not limited to: (i) all costs of borrowed money, taxes and
assessments on the Property and other taxes applicable to the Partnership; (ii)
all costs for goods and materials, whether purchased by the Partnership directly
or by the Managing General Partner on behalf of the Partnership; (iii) legal,
audit, accounting,


                                      -21-
<PAGE>

brokerage and other professional fees; (iv) fees and expenses paid to
independent contractors, mortgage bankers, brokers, insurance brokers and other
agents; (v) expenses of organizing, revising, amending, converting, modifying or
terminating the Partnership; (vi) expenses in connection with distributions made
by the Partnership to, and communications and bookkeeping work necessary in
maintaining relations with, Partners; (vii) expenses in connection with
preparing and mailing reports to Partners; (viii) costs of any accounting,
statistical or bookkeeping equipment necessary for the maintenance of the books
and records of the Partnership; (ix) the cost of preparation and dissemination
of informational material and documentation relating to the Partnership; (x)
except with respect to litigation solely among the Partners as such, costs
incurred in connection with any litigation in which the Partnership is involved,
as well as in the examination, investigation or other proceedings, conducted
against the Partnership by any regulatory agency, including legal and accounting
fees incurred in connection therewith; (xi) costs of any computer services or
equipment or services of personnel used for or by the Partnership; and (xii)
expenses of professionals employed by the Partnership in connection with any of
the foregoing, including attorneys, accountants and appraisers.

      20. Authority of Managing General Partner. Except as otherwise provided
herein, the Managing General Partner may bind the Partnership to do all acts
that are necessary, appropriate, or incidental to the accomplishment of the
purposes of the Partnership. Any person dealing with the Partnership or the
Managing General Partner may rely on a certificate signed by the Managing
General Partner as to the identity of any Partner, the existence or absence of
any fact or condition that is necessary to permit action by either the
Partnership or the Managing General Partner or germane in any other way to the
affairs of the Partnership, and the persons who are authorized to execute and
deliver any documents or instruments of or on behalf of the Partnership. Without
limiting the generality of the foregoing, the Managing General Partner is
specifically authorized to do the following:

            (a) to negotiate and enter into leases and agreements with land or
building owners or other Persons, and to incur obligations for, and on behalf
of, the Partnership in connection with Partnership business;

            (b) to borrow money on behalf of the Partnership and, as security
therefore, to encumber the Property;

            (c) to prepay, in whole or in part, refinance, increase, modify or
extend any obligation affecting the Property;

            (d) to sell, exchange, convey and lease the Property;

            (e) to employ from time to time, at the expense of the Partnership,
other Persons required for the operation and management of the


                                      -22-
<PAGE>

Partnership business, including accountants, attorneys and others, who may be
Partners, on such terms and for such compensation as the Managing General
Partner determines to be reasonable and this may include Persons which are
Affiliates;

            (f) to pay all attorney's and accountant's fees and other costs
incurred in connection with the formation of the Partnership business and the
completion of all steps necessary or advisable for the Partnership to comply
with applicable laws;

            (g) to assume the responsibilities imposed on the Managing General
Partner by the Act;

            (h) to compromise, arbitrate or otherwise adjust claims in favor of
or against the Partnership and to carry such insurance as the Managing General
Partner considers advisable;

            (i) to exercise the voting rights associated with the securities and
other Property owned by the Partnership;

            (j) to commence or defend litigation with respect to the Partnership
or any assets of the Partnership as the Managing General Partner considers
advisable, at the expense of the Partnership;

            (k) to make, execute, acknowledge and deliver documents of transfer
and conveyance and any other instruments that may be necessary or appropriate to
carry out its powers; and

            (l) to do all such acts and take all such proceedings and execute
all such rights and privileges, although not specifically mentioned herein, as
the Managing General Partner considers necessary to conduct the business of the
Partnership and to carry out the purposes of the Partnership.

            Notwithstanding the foregoing, the Managing General Partner shall
not take any of the fo11owing actions without the consent of a Majority in
Interest:

                        (1) assign all or any part of the property for the
benefit of its creditors or confess a judgment against the Partnership;

                        (2) take any action in contravention of the Act, the
certificate of limited partnership or this Agreement;

                        (3) sell, lease, transfer, assign, pledge or encumber
the property of the Partnership (except with respect to transactions to which
section 32 or section 37 applies);


                                      -23-
<PAGE>

                        (4) loan an amount of money in excess of $100,000 to a
Partner; or

                        (5) admit a Person as a General Partner of the
Partnership.

      21. Special Limitation. During the period the Partners have determined
that the Partnership will only be availed of only for investment purposes, which
shall be the period, if any, contemplated by Section 6(c), the Managing General
Partner may not purchase, sell, or exchange Marketable Securities or assets that
pertain to a Class B Partnership Interest or other security without the consent
of the Partners to whom the Marketable Securities are deemed owned or allocated
for federal income tax purposes, but the Managing General Partner shall have
voting rights and all other aspects of management and control over such
Marketable Securities and assets to which a Class B Partnership Interest
pertains.

      22. Dealing with Affiliates. The Managing General Partner may employ and
enter into contracts and other arrangements with any Person, including an
Affiliate, and may obligate the Partnership to pay reasonable compensation for
services rendered by such Persons on terms that, in the judgment of the Managing
General Partner, are not less favorable to the Partnership than would be
available from an unrelated party.

      23. Indemnification of Managing General Partner. The Managing General
Partner need not secure the performance of its duties by bond or otherwise. A
General Partner is not liable, responsible, or accountable in damages or
otherwise to any Partner or to the Partnership for any act taken or omission
made in good faith on behalf of the Partnership and in a manner that such
General Partner reasonably believes to be within the scope of the authority
granted to it by this Agreement and in the best interest of the Partnership,
except for gross negligence or willful misconduct. Any loss, expense (including
attorneys' fees) or damage incurred by a General Partner by reason of any act or
omission by it in good faith on behalf of the Partnership and in a manner that
it reasonably believes to be within the scope of the authority granted to it by
this Agreement and in the best interest of the Partnership (but not, in any
event, any loss, expense or damage incurred by a General Partner by reason of
gross negligence or willful misconduct) shall be paid to the indemnified General
Partner from the Partnership's assets, to the extent available.

      24. Liability of Limited Partners. The liability of each Limited Partner
is limited to its Capital Contributions. Except as provided by the Act, a
Limited Partner is not required to contribute money to, or for the liabilities
of the Partnership, and is not personally liable for any loss, liability or
other obligations of the Partnership.

      25. Authority of Limited Partners and Non-Managing General Partners. The
Limited Partners shall not participate in the management of, or have any control
over,


                                      -24-
<PAGE>

the business or policies of the Partnership, nor any control over Marketable
Securities, except as required by the Act or permitted by section 20, and the
Limited Partners shall not transact any business in the name of the Partnership.
Notwithstanding the foregoing, the Partners may make the election set forth in
Treas. Reg. ss. 1.761-2 to have the Partnership excluded from the provisions of
Subchapter K of Chapter 1 of the Code. In the event a Partner ceases (whether
through removal, death, or resignation) to serve as Managing General Partner, a
Majority in Interest of the Partners shall appoint another Partner to serve as
the Managing General Partner.

                                   ARTICLE VII

                        TRANSFER OF PARTNERSHIP INTERESTS

      26. Limited Partners. A Limited Partner shall not pledge, encumber or
hypothecate his interest in the Partnership without the consent of the Managing
Partner. Otherwise, subject to sections 28 and 29, and only if the
Managing General Partner consents, a Limited Partner may make an Assignment of a
Limited Partnership Interest. However, an Assignment does not relieve the
Limited Partner of his obligations and liabilities under this Agreement, or
constitute the assignee a Limited Partner, or confer on the assignee any
Partnership Rights. An assignee of a Limited Partner's Partnership Interest may
be admitted and substituted as a Limited Partner and acquire Partnership Rights
only upon the satisfactory completion of the requirements specified in section
29. The failure or refusal of the Managing General Partner to consent to the
admission of an assignee as a Limited Partner does not affect the right of the
assignee to the Partnership Interest of his predecessor in interest.

      27. General Partner. Subject to section 28, a General Partner may make an
Assignment, directly or indirectly, of all or any part of its Partnership
Interest. However, an Assignment does not relieve such General Partner of its
obligations and liabilities under this Agreement, or constitute the assignee a
General Partner, or confer on the assignee any Partnership Rights. Subject to
section 28, and only if a Majority in Interest consents, a General Partner may
make an Assignment of both its Partnership Interest and its Partnership Rights
if the assignee assumes in writing all such General Partner's obligations and
liabilities under this Agreement and if all the applicable requirements of
section 29 are satisfied. Upon compliance with the immediately preceding
sentence, an assignee of such General Partner has all the rights and powers
granted to such General Partner under this Agreement and has all the obligations
and liabilities of such General Partner under this Agreement.

      28. Restriction on Transfer. Notwithstanding any other provision of this
Agreement, an assignment of a Partnership Interest shall not be made, and
consent thereto shall be withheld:


                                      -25-
<PAGE>

            (a) Unless the Managing General Partner has satisfied itself (by
seeking advice of legal counsel or otherwise, with any resulting Partnership
expense to be reimbursed by the assignor) that the assignment will not have any
significant adverse tax effect upon the Partnership or the other Partners;

            (b) Unless the Managing General Partner has satisfied itself (by
advice of legal counsel, with any resulting Partnership expense to be reimbursed
by the assignor) that the proposed assignment may be made without registration
under any applicable securities law; and it will not violate any applicable
securities law (including investor suitability standards);

            (c) If the Assignment is sought to be made to:

                  (i) a minor or incompetent, except if made by will or
intestate succession, or

                  (ii) to a Person which is not an Affiliate.

      29. Admission of Substitute Partner. Subject to the other provisions of
this Agreement, an assignee of a Partnership Interest may be admitted as a
Partner and granted Partnership Rights only if:

            (a) the Assignment is made pursuant to a written instrument in a
form satisfactory to the Managing General Partner and specifies the intention of
the assignor that the assignee be substituted as a Partner;

            (b) the Managing General Partner consents to the admission by
executing two counterparts of this Agreement that evidences the Partnership
Rights of the assignee, and if the assignee is to be admitted as a Partner a
Majority in Interest consent to the admission;

            (c) the assignee accepts, signs and agrees to be bound by this
Agreement, by executing two counterparts of this Agreement, including an amended
Exhibit A, and such other documents or instruments as the Managing General
Partner requires to effect the admission of the assignee as a Partner;

            (d) the assignee provides the Managing General Partner with evidence
satisfactory to it of the assignee's authority to become a Partner under the
terms of this Agreement;

            (e) the assignee pays all filing, publication and other costs
(including reasonable attorneys' fees) incurred by either the Partnership or the
Managing General Partner in connection with the admission and substitution of
the assignee as a Partner.


                                      -26-
<PAGE>

            Notwithstanding an assignee's satisfaction of any or all of the
conditions specified above, the Managing General Partner, in its absolute
discretion, may refuse to consent to the assignee's admission as a Partner, in
which event the assignee will not obtain any Partnership Rights, but will retain
only the rights of an assignee under sections 26 or 27.

      30. Rights of Partner After Assignment and Substitution. Upon the
Assignment of all his Partnership Interest, and the admission of a substitute
partner, a Partner shall cease to be a Partner and to have any Partnership
Rights.

      31. Allocations and Distributions After Assignment. For the purposes of
allocations of Profits and Losses, Taxable Income or Taxable Loss, and
distributions, an Assignment of a Partnership Interest is effective as to the
Partnership, and shall be reflected in the records of the Partnership, as of the
date that the Managing Genera1 Partner receives written notice of the
Assignment. The Taxable Income or Taxable Loss, Profits and Losses and cash and
other distributions in respect of the assigned Partnership Interest with respect
to the fiscal year in which the Assignment of the Partnership Interest occurs
shall be divided between the assignor and the assignee according to the method
provided to the Managing General Partner by the assignor and the assignee, so
long as such method is permitted under the Code and does not adversely affect
the other Partners or the Partnership from a tax or economic perspective. The
method of allocation shall be provided to the Managing General Partner in the
written notice of the Assignment. Any additional costs for computing the
allocations hereunder shall be paid by the assignor or assignee, as the case may
be. The written notice referred to above shall also contain information as to
whether the assignor or assignee shall be responsible for the payment of such
additional cost, if any.

                                  ARTICLE VIII

                 RETIREMENT, WITHDRAWAL, OR REMOVAL OF PARTNERS

      32. Withdrawal of General Partner or Limited Partner.

            (a) A Limited Partner may, at any time, withdraw all or part of his
Partnership Interest from the Partnership by providing written notice thereof to
the Managing General Partner. Immediately after the receipt of such written
notice from a Partner, the Managing General Partner shall make the appropriate
distributions to the Partner in partial or complete redemption of his
Partnership Interest as set forth in section 16(b).

            (b) A partial withdrawal by a Partner shall be made in increments of
one-tenth (1/10th) of one percent (1%) of a Percentage Interest. The written
notice of withdrawal from a Partner to the Managing General Partner must


                                      -27-
<PAGE>

state whether the withdrawal is a partial or complete withdrawal and, if a
partial withdrawal, must state the Percentage Interest that is being withdrawn.
A Partner shall not make a partial withdrawal that will result in his remaining
Percentage Interest becoming less than one-tenth (1/10th) of one percent (1%)
immediately after the withdrawal.

            (c) The Managing General Partner agrees that it will fully cooperate
to the extent permitted by law to accomplish a withdrawal requested by a Partner
hereunder. It also agrees that it will not take any action that will obstruct or
render impossible the application of this section 32 (such as to pledge the
Partnership's Marketable Securities as collateral to creditors of the
Partnership), unless such action is essential to accomplish the purposes of the
Partnership.

            (d) The partial withdrawal of a Limited Partner does not dissolve or
terminate the Partnership unless there is only one Partner then remaining. The
remaining Partners shall amend this Agreement to reflect the partia1 or complete
withdrawal of the Partner from the Partnership, if and to the extent necessary.

            (e) Upon the giving of the notice of withdrawal pursuant to
Paragraph (a), and upon the dissolution of the Partnership, the voting rights
with respect to any Marketable Securities allocable to the Percentage Interest
being withdrawn shall be vested in the withdrawing Partner or Partners, and the
Partnership shall have no voting rights with respect to such stock.

            (f) The complete withdrawal of all the Limited Partners shall
constitute a dissolution of the Partnership pursuant to Article IX.

      33. Retirement, Removal, or Withdrawal of Managing General Partner. The
Managing General Partner may withdraw any part of its General Partnership
Interest without the consent of a Majority in Interest. The Retirement, removal,
or withdrawal of the Managing General Partner shall dissolve the Partnership
only if there is no successor General Partner. Notwithstanding the foregoing or
anything else in this Agreement to the contrary, a merger, consolidation, or
reorganization of a Managing General Partner who is not a natural person, or a
sale of all or substantially all its assets that includes its Partnership
Interest, is not a Retirement or withdrawal of such Managing General Partner if
the resulting, surviving or acquiring Person is an Affiliate and becomes
substituted as the Managing General Partner of the Partnership. The resulting,
surviving or acquiring Person is substituted as the Managing General Partner
without further act if it gives notice of the substitution to the Partners
before the effective date of the merger, consolidation, reorganization or sale.
Each Partner consents to the admission and substitution of such substitute
Managing General Partner pursuant to this section 33, and no further consent or
approval of any Partner is required.


                                      -28-
<PAGE>

      34. Retirement of Limited Partner. The Retirement of a Limited Partner
does not dissolve or terminate the Partnership except as provided in section
36(g), but the legal or personal representatives, heirs, successors, assignees,
or stockholders of a Retired Limited Partner, subject to section 26, shall
succeed to the Partnership Interests of the Retired Limited Partner and may make
an Assignment of the Partnership Interests within the limitations set forth in
this Agreement.

      35. Rights of Partner After Retirement, Removal, or Withdrawal. A Partner
ceases to have any Partnership Rights upon his Retirement, removal, or complete
withdrawal from the Partnership. However, until the appropriate distributions,
if any, are made to a Retired, removed, or withdrawn Partner for his Partnership
Interest, the Retired, removed, or withdrawn Partner is entitled to receive the
allocations of Profits and Losses, Taxable Income or Taxable Loss and all
distributions referred to in section 16 applicable to his Partnership Interest.

                                   ARTICLE IX

                                   DISSOLUTION

      36. Events of Dissolution. The Partnership shall be dissolved, and unless
reconstituted shall be terminated, upon:

            (a) the expiration of its term;

            (b) the vote of a Majority in Interest to dissolve the Partnership;

            (c) the Partnership being adjudicated insolvent or bankrupt;

            (d) the Retirement, removal, or withdrawal of the Managing General
Partner;

            (e) the death of Barry Silverstein; or

            (f) the sale of all or substantially all of the Partnership's
Property.

            (g) the complete withdrawal of the Limited Partners.

      37. Winding-Up and Distributions. Upon the dissolution of the Partnership
pursuant to section 36, and unless the Partnership is reconstituted, the
winding-up of the Partnership's business and the liquidation and distribution of
Partnership assets must be carried out with due diligence and in a timely
manner, and consistent with both the requirements of applicable law and the
following provisions of this section:


                                      -29-
<PAGE>

            (a) The Managing General Partner shall be responsible for taking all
actions relating to the winding-up, liquidation, and distribution of assets of
the Partnership, unless its Retirement, removal, or withdrawal causes the
dissolution, in which case the fiscal agent, liquidator, or receiver appointed
(without judicial action) by a Majority in Interest shall be so responsible. The
Managing General Partner, or the appointed fiscal agent, liquidator, or
receiver, is referred to in this Agreement as the "Liquidator." A Limited
Partner can be appointed to be the Liquidator. The Liquidator shall file all
certificates or notices of the dissolution of the Partnership as required by
law. Upon the complete liquidation and distribution of the Partnership assets,
the Partnership shall terminate, and the Liquidator shall execute, acknowledge,
and cause to be filed all certificates and notices required by law to terminate
the Partnership.

            (b) The Liquidator shall proceed without unnecessary delay to sell
and otherwise liquidate the Partnership's assets. Unless directed otherwise by a
Majority in Interest, all Marketable Securities, cash and other readily
divisible or fungible assets of the Partnership shall be distributed directly to
the Partners in the manner set forth in section 16(c)(i). The Liquidator shall
promptly sell the other assets of the Partnership unless it determines that an
immediate sale of part or all of such assets would cause undue loss to the
Partners. In such case, the Liquidator, to avoid such loss, may defer the
liquidation of the Partnership assets for a reasonable time, except for those
liquidations that are necessary to satisfy the debts and liabilities of the
Partnership to persons and parties other than the Partners. The Liquidator shall
distribute the proceeds from the liquidation of the Partnership's assets as
provided in section 16(c).

            (c) Upon the dissolution of the Partnership pursuant to section 36,
and unless the Partnership is reconstituted, the Liquidator shall cause the
accountants for the Partnership to prepare within ninety (90) days after the
occurrence of the event of dissolution, and immediately thereafter shall furnish
to each Partner, a statement setting forth the assets and liabilities of the
Partnership as of the date of its dissolution. The Liquidator, promptly
following the complete liquidation and distribution of the Partnership's assets,
shall cause the Partnership's accountants to prepare, and the Liquidator shall
furnish to each person who is a Partner immediately before the dissolution, a
statement showing the manner in which the Partnership assets were liquidated and
distributed.

      38. Distribution of Liquidation Proceeds and Assets and Allocation of
Gains and Losses. Subject to the last sentence of 12(d), the net proceeds from
liquidation of the Partnership's assets and the unliquidated Property of the
Partnership shall be distributed, and all Profits and Losses resulting from the
liquidation of the Partnership shall be allocated, among the Partners in the
proportions and orders of priority specified in section 16(c).


                                      -30-
<PAGE>

      39. Limitation of Liability of Partners. Upon the dissolution of the
Partnership and the distribution of the net liquidation proceeds pursuant to
section 36 and section 16(c), each Partner shall look solely to the assets of
the Partnership for the payment of his unreturned Capital Contributions, and if
the Partnership's assets remaining after the payment or discharge of the debts
and liabilities of the Partnership are insufficient to pay the full amount of
the unreturned Capital Contributions of each Partner, the Partner shall have no
recourse or claim against any Partner or the Partnership with respect to its
unreturned Capital Contributions, except for claims for fraud, gross negligence,
or breach of fiduciary duty.

      40. Waiver of Right of Partition of Assets. Each Partner, and for his
heirs, successors, and assigns, waives his right to the partition of the assets
of the Partnership upon the dissolution and liquidation of the Partnership.

                                    ARTICLE X

                  ACCOUNTING YEAR, BOOKS, RECORDS, AND REPORTS

      41. Books and Records. In accordance with the Act, the Managing General
Partner shall maintain at the principal office of the Partnership a complete and
accurate set of books of records and accounts, in which it shall make full and
complete entries of all dealings or transactions relating to the Partnership's
business and where it shall keep all supporting documentation of transactions
with respect to the conduct of the Partnership's business. The Managing General
Partner may delegate responsibility to those persons as a Majority in Interest
and agree to compile and maintain all required information and prepare all
required materials provided for in this Agreement. Each Partner or his duly
authorized representative, upon five days' advance notice to the Managing
General Partner, may examine during normal business hours the books of the
Partnership and all other records and information concerning the operation of
the Partnership.

      42. Reports. If requested by a Partner at least 30 days prior to the end
of a quarter, within 60 days after the end of each fiscal quarter in each fiscal
year of the Partnership, the Managing General Partner shall cause to be prepared
and sent to each Partner a balance sheet, income statement and cash flow
statement of the Partnership for and as of the end of that fiscal quarter, in
each case unaudited but accompanied by a report of the activities of the
Partnership for that quarter. Within 90 days after the end of each fiscal year
of the Partnership, the Managing General Partner shall cause to be prepared and
sent to each Partner a financial report consisting of (a) a balance sheet as of
the end of the fiscal year; (b) statements of income, partner's equity, and
changes in financial position for the fiscal year; (c) if requested by a
Partner, the opinion of the Partnership's certified public accountant concerning
the foregoing financial statements; (d) a summary of the Partnership's
activities for the fiscal year;


                                      -31-
<PAGE>

(e) a statement showing the distributions to each Partner during the fiscal year
and identifying any distributions which constitute a return of Capital
Contribution; and (f) a statement showing the amount of Taxable Income or
Taxable Loss, and listing each item of income, gain, loss, deduction, or credit
allocated or charged against the Partner for federal and state income tax
purposes.

      43. Bank Accounts. The Managing General Partner shall maintain the bank
accounts of the Partnership in such financial institutions as the Managing
General Partner considers appropriate. The Managing General Partner shall make
or permit withdrawals from the Partnership's bank accounts on the signature of
the Managing General Partner.

      44. Tax Elections. If the Partnership has not made the election set froth
in Treas. Reg. ss. 1.761-2, or if Subchapter K of Chapter 1 of the Code applies
to the Partnership, the Partnership shall file an election under Section 754 of
the Code, relating to the optional adjustment to the basis of partnership
property, at the first time it is permitted to do so after the beginning of the
term of this Partnership. The Managing General Partner shall make or waive, at
its discretion, all other tax elections required or permitted to be made by the
Partnership under the Code.

      45. Accounting Method and Fiscal Year. The Managing General Partner shall
maintain the Partnership records and books of accounts in accordance with the
cash method of accounting, with such modifications as are set forth in this
Agreement, and otherwise in accordance with genera11y accepted accounting
principles consistently applied. The fiscal year of the Partnership is the
calendar year.

                                   ARTICLE XI

                               GENERAL PROVISIONS

      46. Power of Attorney. Each Limited Partner (including each substitute
Limited Partner), by executing a counterpart of this Agreement, irrevocably
constitutes and appoints, with full power of substitution, the General Partner
as his true and lawful attorney-in-fact, with full power and authority in his
name, place and stead to make, execute, acknowledge, deliver, swear to, publish,
record and file:

            (a) any certificate or other instrument that may be required to be
fi1ed, published or recorded by the Partnership under the Act or any other law
of Delaware or that the Managing Genera1 Partner considers advisable to file,
publish or record;

            (b) all documents (including schedules and amendments to this
Agreement) that may be required to effect the continuation or reinstatement of
the


                                      -32-
<PAGE>

Partnership, admit an additional or substitute Partner (other than any approval
required of Limited Partners), reduce the Capital Contributions of a Partner, or
dissolve and terminate the Partnership; and

            (c) all amendments to this Agreement adopted in accordance with
section 54.

The foregoing power of attorney is coupled with an interest, resulting from each
Limited Partner's reliance on the power of the attorney-in-fact to act as
contemplated by this Agreement for the purposes described in this section 46.
The foregoing power of attorney shall survive the Retirement of a Limited
Partner and the Assignment by any Limited Partner of all or any part of his
Partnership Interest, except that when an assignee is granted Partnership Rights
and admitted as a substitute Limited Partner the power of Attorney of the
assignor Limited Partner shall survive the Assignment only for the purpose of
enabling the non-managing General Partner to make, execute, acknowledge,
deliver, swear to, publish, record and file every instrument necessary to effect
the substitution.

      47. Partnership Contracts. The Managing General Partner may enter into
agreements and contracts on behalf of the Partnership only if they are in
writing and clearly indicate to the other parties that the Partnership is a
general partnership of which the Managing General Partner is a general partner.

      48. Conveyances. Subject to section 20, the Managing General Partner may
sign any deed, mortgage, lease, bill of sale, security agreement, pledge,
contract or other instrument or commitment purporting to convey or encumber any
of the Partnership's Property or any interest therein, whether now or
subsequently owned or leased at any time by the Partnership, and no other
signature is required.

      49. Notices. To be effective, a notice required or permitted by this
Agreement must be in writing, or by telegram, telex or telecopy if promptly
confirmed in writing. A notice is given when delivered or, if mailed, when
deposited in a United States postal service letterbox to be sent by first class,
postage-prepaid, certified mail, with return receipt requested (whether or not
the sender receives the return receipt), and addressed, if to a Partner, at his
registered address listed on Exhibit A and, if to the Managing General Partner
or the Partnership, to the attention of such Managing General Partner at the
Partnership's principal business office.

      50. Consents. Any consent required by this Agreement may be given as
follows:

            (a) by a writing given by the consenting Partner and received by the
Managing General Partner or other appropriate recipient at or before the


                                      -33-
<PAGE>

occurrence of the action or other thing for which the consent was solicited,
unless the consent is nullified by:

                  (i) A writing from the consenting Partner that is received by
the Managing General Partner before the occurrence of the action or other thing
for which the consent was so1icited; or

                  (ii) the negative vote by the consenting Partner at any
meeting called for the purpose of considering the action or other thing.

            (b) by the affirmative vote of the consenting Partner at any meeting
called for the purpose of considering the action or other thing for which the
Partner's consent was solicited.

      51. Meetings. The Managing General Partner may call meetings of the
Partners for any purpose, at any, time. The Managing General Partner shall call
a meeting of the Partners within 30 days after he receives from a Majority in
Interest a written request for a meeting, stating the purpose of the requested
meeting and the matters proposed for consideration. Meetings of the Partners may
be held at such time, date and place as the Managing General Partner designates.
The Managing General Partner shall give notice of any meeting of the Partners
not less than ten nor more than 60 days before the date of the meeting, to each
Partner at his registered address listed on Exhibit A. The notice shall state
the time, date and place of the meeting, the purpose of the meeting and the
Partner at whose direction or request the meeting is called. Except in the case
of emergency, meetings of the Partnership shall be held in Delaware or South
Carolina. If a meeting is adjourned to another time or place, notice of the
adjourned meeting is not required if the time and place of the adjournment is
announced at the called meeting. The presence in person or by proxy of a
Majority in Interest constitutes a quorum at a meeting. Any notice of a meeting
required by this section may be waived in writing at, before or after the
meeting and shall be deemed to be waived by each Partner who is present in
person or by proxy at the meeting. Only those persons who are Partners at the
close of business on the day before the meeting are entitled to vote at the
meeting. Any Partner entitled to vote at a meeting may authorize any person to
act for him by written proxy if a copy of the proxy is delivered to the Managing
General Partner before the commencement of the meeting. To be effective, a proxy
must be signed by the Partner (and, if applicable, each co-owner) or his duly
appointed attorney-in-fact, and no proxy shall be valid for more than 11 months
after its date. A proxy is revocable at the pleasure of the Partner granting it.

      52. Binding Effect; Counterparts. The covenants and agreements contained
in this Agreement are binding on, and inure to the benefit of, the legal and
personal representatives, heirs, successors and permitted assignees of the
parties to this Agreement. The parties may execute this Agreement in any number
of counterparts,


                                      -34-
<PAGE>

each of which will be an original, but all of which together will constitute one
and the same agreement.

      53. Choice of Law. This Agreement and the rights and obligations of the
Partners under it are governed by, and construed and enforced in accordance
with, the laws of Delaware.

      54. Complete Agreement; Modification. This Agreement contains the final,
complete and exclusive expression of the understanding among the Partners with
respect to the Partnership and its purposes and objectives and supersedes any
prior or contemporaneous agreement or representation, oral or written, by any of
them. Except to admit a new or a substitute Partner or to reflect the withdrawal
or Retirement of a Partner, this Agreement and every provision of it may be
modified or amended only by an agreement in writing signed by or on behalf of
all Partners.

      55. Evidence of Partnership Interests. The Partnership Interest of each
Partner is evidenced exclusively by a counterpart of this Agreement (including
Exhibit A) that has been signed and dated by the Managing General Partner.

      56. Tax Matters Partner. The General Partner or its designee shall be the
"tax matters partner" of the Partnership for federal income tax purposes.
Pursuant to Section 6223(c)(2) of the Code, upon receipt of notice from the
Internal Revenue Service of the beginning of an administrative proceeding with
respect to the Partnership, the General Partner, as the tax matters partner,
shall furnish the Internal Revenue Service with the names, addresses, and
Percentage Interests of each of the Partners. The General Partner agrees not to
enter into a settlement agreement pursuant to Section 6224 of the Code without
providing at least 30 days advance written notice to each Partner. As tax
matters partner, the General Partner shall have absolute discretion regarding
whether to seek judicial review of any administrative determination and, if it
determines to seek judicial review of Internal Revenue Service action pursuant
to Section 6226 of the Code, then the General Partner shall select the judicial
forum for such review. The tax matters partner shall receive no compensation for
its services as such. The Partnership shall bear all third party costs and
expenses incurred by the tax matters partner in performing its duties as such.
Nothing herein shall be construed to restrict the Partnership from engaging an
accounting firm or law firm to assist the tax matters partner in discharging its
duties hereunder.

      57. Gender and Number. As used in this Agreement, the masculine gender
includes the feminine and neuter, and the singular includes the plural.

      58. Title. Title to any Property acquired by the Partnership shall be
taken in the name of the Partnership.


                                      -35-
<PAGE>

      IN WITNESS WHEREOF, this agreement has been executed by or on behalf of
each Partner as of the date written beside his name.


                                GENERAL PARTNER:


                                S.B. Investment Management, Inc.


                                /s/ Steven Blechner
                                ------------------------------------------
                                Steven Blechner                   11/22/99
                                As its President
                                Effective November 22, 1999


                                LIMITED PARTNER:


                                /s/ Barry Silverstein
                                ------------------------------------------
                                Barry Silverstein                 11/19/99

<PAGE>

                             FIRST AMENDMENT TO THE
                        LIMITED PARTNERSHIP AGREEMENT OF
                 SILVERSTEIN INVESTMENTS LIMITED PARTNERSHIP II

            This First Amendment of Agreement of Limited Partnership is made as
of the 16th day of September 2003, by and among S.B. INVESTMENT MANAGEMENT,
Inc., as general partner (the "General Partner"), and BARRY SILVERSTEIN as
limited partner (the "Limited Partner").

            WHEREAS, the Limited Partnership Agreement of Silverstein
Investments Limited Partnership II (the "Agreement") was executed on the 22nd
day of November, 1999 under the laws of the state of Delaware; and;

            WHEREAS, Paragraph 54 of the Agreement provides that the Agreement
may be amended by an agreement in writing signed by or on behalf of all
Partners; and

            WHEREAS, the undersigned, being the General Partner and persons
representing all of the Limited Partnership interests, wish to amend and restate
the Agreement as hereinafter set forth.

            NOW, THEREFORE, the undersigned do hereby amend the Agreement as
follows:

            1) Section 32.(a) of the Agreement is hereby amended in its entirety
to read as follows:

                  32.(a) A Limited Partner may withdraw all or part of his
            Partnership Interest from the Partnership only with the prior
            written consent of the Managing General Partner.

            2) Section 36. of the Agreement is hereby amended in its entirety to
read as follows:

<PAGE>

                  36. Events of Dissolution. The Partnership shall be dissolved,
            and unless reconstituted shall be terminated, upon:

                  (a) the expiration of its term:

                  (b) the Partnership being adjudicated insolvent or bankrupt;

                  (c) the Retirement, removal, or withdrawal of the Managing
            General Partner;

                  (d) the sale of all or substantially all of the Partnership's
            Property; or

                  (e) the complete withdrawal of the Limited Partner.

            3) Except as amended hereby, the Agreement remains in full force and
effect.

<PAGE>

IN WITNESS WHEREOF, the parties have executed this agreement as of the date
first set forth above.

                                GENERAL PARTNER:

                                S.B. Investment Management, Inc.


                                ---------------------------------------
                                Steven Blechner
                                As its President


                                LIMITED PARTNER:

                                /s/ Barry Silverstein
                                ---------------------------------------
                                Barry Silverstein

<PAGE>

IN WITNESS WHEREOF, the parties have executed this agreement as of the date
first set forth above.

                                GENERAL PARTNER:

                                S.B. Investment Management, Inc.

                                /s/ Steven Blechner
                                ---------------------------------------
                                Steven Blechner
                                As its President


                                LIMITED PARTNER:


                                ---------------------------------------
                                Barry Silverstein

<PAGE>

                                SECOND AMENDMENT

                                     to the

                          LIMITED PARTNERSHIP AGREEMENT

                                       of

                  SILVERSTEIN INVESTMENT LIMITED PARTNERSHIP II

      THIS SECOND AMENDMENT to the LIMITED PARTNERSHIP AGREEMENT of SILVERSTEIN
INVESTMENT LIMITED PARTNERSHIP II (the "Partnership") (this "Amendment") is made
as of June 24, 2004, by and among (i) S.B. Investment Management, Inc., (ii)
Trudy Silverstein and Dennis McGillicuddy, as Trustees of the JM Silverstein
2003 CLAT, which trust was created under indenture dated September 22, 2003 by
and between Barry Silverstein, as Grantor, and Trudy Silverstein and Dennis
McGillicuddy, as Trustees (the "JM Silverstein 2003 CLAT") (iii) Mark Shale
Silverstein and Dennis McGillicuddy, as Trustees of the Mark S. Silverstein 2003
CLAT, which trust was created under indenture dated September 22, 2003 by and
between Barry Silverstein, as Grantor, and Mark Shale Silverstein and Dennis
McGillicuddy, as Trustees (the "Mark S. Silverstein 2003 CLAT"), (iv) Mark Shale
Silverstein and Dennis McGillicuddy, as Trustees of the Susan S. Potter 2003
CLAT, which trust was created under indenture dated September 22, 2003 by and
between Barry Silverstein, as Grantor, and Mark Shale Silverstein and Dennis
McGillicuddy, as Trustees (the "Susan S. Potter 2003 CLAT") and (v) Mark Shale
Silverstein and Dennis McGillicuddy, as Trustees of the Thomas Benjamin
Silverstein 2003 CLAT, which trust was created under indenture dated September
22, 2003 by and between Barry Silverstein, as Grantor, and Mark Shale
Silverstein and Dennis McGillicuddy, as Trustees (the "Thomas Benjamin
Silverstein 2003 CLAT"). Capitalized terms used but not otherwise defined herein
are defined in the Limited Partnership Agreement of the Partnership (the
"Agreement").

            WHEREAS, the parties hereto wish to amend that certain Agreement,
dated as of November 22, 1999;

            WHEREAS, the parties hereto wish to remove the consent requirement
of a Majority in Interest as to certain transactions to be taken on behalf of
the Partnership by the Managing General Partner;

            NOW, THEREFORE, in consideration of the mutual covenants contained
herein, and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties to this Amendment hereby agree as
follows:

            1. Purpose of Partnership. Upon the date hereof, Section 6(a)(ii) of
the Agreement is amended in its entirety to read as follows:
<PAGE>

      "acquire, hold, sell, own, improve, develop or lease other types of
property in addition to Marketable Securities, and"

            2. Authority of Managing General Partner. Upon the date hereof,
Section 20(3) shall be deleted in its entirety.

            3. Amendment and Waiver. Except as otherwise provided herein, no
modification, amendment or waiver of any provision of this Amendment shall be
effective unless such modification, amendment or waiver is approved in writing
in accordance with Section 54 of the Agreement. The failure of any party to
enforce any of the provisions of this Amendment shall in no way be construed as
a waiver of such provisions and shall not affect the right of such party
thereafter to enforce each and every provision of this Amendment in accordance
with its terms.

            4. Severability. Whenever possible, each provision of this Amendment
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Amendment is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Amendment shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

            5. Entire Agreement. Except as otherwise expressly set forth herein,
this document embodies the complete agreement and understanding among the
parties hereto with respect to the subject matter hereof and supersedes and
preempts any prior understandings, agreements or representations by or among the
parties, written or oral, which may have related to the subject matter hereof in
any way.

            6. Successors and Assigns. Except as otherwise provided herein, this
Amendment shall bind and inure to the benefit of and be enforceable by the
Partnership, the parties hereto and their respective successors and assigns.

            7. Counterparts. This Amendment may be executed in separate
counterparts (including by means of telecopied signature pages), each of which
shall be an original and all of which taken together shall constitute one and
the same agreement.

            8. Governing Law. This Amendment is governed by and shall be
construed in accordance with the law of the States of Delaware, excluding any
conflict-of-laws rule or principal that might refer the governance or
construction of this Amendment to the law of another jurisdiction.

            9. Descriptive Headings. The descriptive headings of this Amendment
are inserted for convenience only and do not constitute a part of this
Amendment.

                                    * * * * *


                                        2
<PAGE>

            IN WITNESS WHEREOF, the parties hereto have executed this Amendment
on the day and year first above written.

                              S.B. INVESTMENT MANAGEMENT, INC.

                              By:   /s/ Steven Blechner
                                    ------------------------------
                              Name: Steven Blechner
                              Its:  President


                              JM SILVERSTEIN 2003 CLAT

                              By:   /s/ Dennis J. McGillicuddy
                                    ------------------------------
                              Name: Dennis J. McGillicuddy
                              Its:  Trustee

                              By:   /s/ Trudy Silverstein
                                    ------------------------------
                              Name: Trudy Silverstein
                              Its:  Trustee


                              MARK S. SILVERSTEIN 2003 CLAT

                              By:   /s/ Dennis J. McGillicuddy
                                    ------------------------------
                              Name: Dennis J. McGillicuddy
                              Its:  Trustee


                              SUSAN S. POTTER 2003 CLAT

                              By:   /s/ Dennis J. McGillicuddy
                                    ------------------------------
                              Name: Dennis J. McGillicuddy
                              Its:  Trustee

                              By:   /s/ Mark S. Silverstein
                                    ------------------------------
                              Name: Mark S. Silverstein
                              Its:  Trustee
<PAGE>

                              THOMAS BENJAMIN SILVERSTEIN 2003 CLAT

                              By:   /s/ Dennis J. McGillicuddy
                                    ------------------------------
                              Name: Dennis J. McGillicuddy
                              Its:  Trustee

                              By:   /s/ Mark S. Silverstein
                                    ------------------------------
                              Name: Mark S. Silverstein
                              Its:  Trustee


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5
<SEQUENCE>5
<FILENAME>ex-5.txt
<TEXT>

                                                                       Exhibit 5


      INDENTURE OF TRUST made as of the 17th day of September, 2003, by and
between BARRY SILVERSTEIN, as Grantor, and TRUDY SILVERSTEIN and DENNIS
McGILLICUDDY, as Trustees.

                              W I T N E S S E T H :

      The Grantor hereby transfers, assigns and delivers to the Trustees the
property described in Schedule A annexed hereto (and the Trustees hereby
acknowledge receipt of such property), to hold the same, IN TRUST, to invest and
reinvest, to collect the rents, income and profits thereof, and to dispose of
the same upon the terms hereinafter set forth.

      The trust created herein shall be known as the "JM SILVERSTEIN 2003 CLAT."

                                      FIRST

      A. In each year of the "trust term" (as hereinafter defined), the Trustees
shall make payments aggregating the "annuity amount" (as hereinafter defined) to
The William James Foundation, Inc. (or, if The William James Foundation, Inc.
shall not be a "charitable organization" (as defined in Paragraph G below) at
the time of any payment hereunder, to such one or more charitable organizations
in such amounts or proportions, as the Trustees shall, in their sole and
unreviewable discretion, select and determine).

      B. The "trust term" shall mean the twenty-five (25) year period commencing
on the date hereof.

      C. The term "annuity amount" shall be such amount which shall be required
to generate a Federal gift tax charitable deduction equal to the value of the
initial net fair market value of the principal of such trust as finally
determined for Federal gift tax purposes, for the annuity which is to be paid
pursuant to the terms of Paragraph A above, as calculated using (a) the lowest

<PAGE>

Applicable Federal Rate promulgated by the Treasury Department for valuing
annuities which the Trustees may elect to use under Section 7520(a) of the
Internal Revenue Code of 1986, as amended (hereinafter referred to as the
"Code"), and (b) the procedures promulgated by the Treasury Department for
valuing annuities. In determining such initial net fair market value, the assets
of such trust shall be valued at the values finally determined therefor for
Federal estate tax purposes.

            If the initial net fair market value of the property contributed to
the trust created hereunder is incorrectly determined, then, within a reasonable
period after such net fair market value is finally determined, the Trustees
shall (in the case of an undervaluation) pay to or shall (in the case of an
overvaluation) receive from The William James Foundation, Inc. and/or the
charitable organization or charitable organizations, as the case may be, as
shall have received an incorrectly determined annuity amount, and if more than
one, in the proportions in which they shall have shared in such incorrectly
determined annuity amount, an amount equal to the difference between:

                        (a) any annuity amounts actually paid, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period;
            and

                        (b) the annuity amounts payable, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period.


                                       2
<PAGE>

      D. In case of any taxable year of the trust during the trust term which is
for a period of less than twelve months, the annuity amount for such year shall
be prorated on a daily basis.

      E. The Trustees shall make payments under Paragraph A above aggregating
the annuity amount annually. Any payment made during any taxable year of the
trust, or treated (at the election of the Trustees pursuant to Section 642(c)(1)
of the Code) for Federal income tax purposes as having been made during such
year, in satisfaction of the annuity amount, shall first be made from the
ordinary income (including short term capital gain) other than unrelated
business income of the trust for such year, thereafter from capital gains of the
trust for the year, thereafter from unrelated business income of such trust for
the year, thereafter from tax-exempt income and, if and to the extent that such
ordinary income, capital gains and unrelated business income and tax-exempt
income shall be insufficient to pay the annuity amount, then from the principal
of the trust. Any net income not required for the payment of the annuity amount
shall be added to principal.

      F. 1. It is the Grantor's intention that the twenty-five (25) year annuity
payable under this Indenture shall qualify as a deductible charitable interest
under Section 2522(c)(2)(B) of the Code and regulations thereunder and that the
Grantor shall be entitled to a charitable deduction for Federal gift tax
purposes for the full value, as of the date hereof, of such annuity. The Grantor
therefore directs that all provisions of this Indenture shall be interpreted and
construed so as to give effect to such intention and that the Trustees shall pay
all payments on account of the annuity amount at such times and in such amounts
and shall also otherwise administer the trust in such manner as may be required
to qualify such annuity for the aforesaid charitable deduction. If such Section
or regulations, or any successor Section or regulations, or any ruling, notice


                                       3
<PAGE>

or other administrative pronouncement issued thereunder, at any time requires
that an instrument creating a "guaranteed annuity interest" within the meaning
of Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder
must contain provisions that are not expressly set forth herein, such provisions
shall be incorporated into this Indenture of Trust by reference and shall be
deemed to be a part of this Indenture of Trust to the same extent as though they
had been expressly set forth herein. The Trustees shall have the power, acting
by majority, to amend the Trust created hereunder in any manner required for the
sole purpose of ensuring that the annuity amount payable under Article FIRST
hereof qualifies as a "guaranteed annuity interest" within the meaning of
Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder.

            2. If the effect of any provision of this Indenture would be to
prevent the allowance of said charitable deduction for such annuity, then the
Grantor directs that such offending provision shall not apply to the trust.

            3. Anything to the contrary in this trust notwithstanding, during
such time as the trust created hereunder shall be a trust described in Section
4947(a)(2) of the Code, the Trustees shall be prohibited from:

                        (i) engaging in any act of "self-dealing," as defined in
            Section 4941(d) of the Code;

                        (ii) retaining any "excess business holdings," as
            defined in Section 4943(c) of the Code;

                        (iii) making any investments so as to subject the trust
            to tax under Section 4944 of the Code, or retaining any investments
            which would subject the trust to such tax if the Trustees had
            acquired such investments; and

                        (iv) making any "taxable expenditures," as defined in
            Section 4945(d) of the Code.


                                       4
<PAGE>

            4. References to Sections of the Code in this Indenture shall also
be deemed to refer to corresponding provisions of any subsequent Federal tax
law.

            5. No additional contribution shall be made to the trust created
hereunder.

            6. Nothing contained in this Indenture shall be construed to
restrict the

Trustees from investing the assets of the trust in a manner which could result
in the annual realization of a reasonable amount of income or gain from the sale
or disposition of trust assets.

      G. The term "charitable organization" as used in this Indenture shall mean
an organization organized and operated exclusively for religious, charitable,
scientific, literary or educational purposes or for the prevention of cruelty to
children or animals as described in Sections 170(c), 501(c)(3) and 2522(a) of
the Code (or any corresponding provisions of the tax laws from time to time in
effect), gifts to which are deductible for Federal income and gift tax purposes.

                                     SECOND

            Upon the termination of the Term, the trust estate then remaining
(after making any payments required by Paragraph A of Article FIRST) shall be
set aside and divided into such number of equal shares as shall make one share
in respect of each of the Grantor's children from his marriage to Trudy
Silverstein who is living on the date of this Indenture of Trust. The share set
aside in respect of each such child shall be paid over and distributed to such
person or persons (including such child, the estate of such child, his or her
creditors and the creditors of his or her estate) in such amounts or proportions
and upon such estates (whether in trust or otherwise) as such child shall
appoint by instrument in writing, duly signed and acknowledged by him or her and
delivered to a then acting Trustee (other than himself or herself) during his or


                                       5
<PAGE>

her lifetime, or in his or her Last Will and Testament, by specific reference to
this Indenture of Trust. The Grantor directs that any portion or all of the
share set aside with respect to such child remaining at the expiration of the
Term that is not effectively appointed shall be paid over and distributed to
such child, absolutely, or if he or she is not then living, to his or her then
living issue, per stirpes, absolutely, and in default of such issue, to the then
living issue of the Grantor from his marriage to Trudy Silverstein, per stirpes,
or if none, to the then living issue of the Grantor, per stirpes, absolutely.

                                      THIRD

      A. 1. If TRUDY SILVERSTEIN and DENNIS McGILLICUDDY shall cease to act as
trustees hereof, the following are appointed as successor Trustee, to take
office, singly, in the order named: STEPHEN BLECHNER and JAMES B. SHEIN.

            2. Upon attaining the age of majority, each of JACOB MICHAEL
SILVERSTEIN and MOLLY T. HANNAH SILVERSTEIN shall be allowed to qualify as a
co-Trustee to act contemporaneously with the then acting Trustees of the trust
created hereunder.

            3. The last to act of the Trustees (including substitutes and/or
successors) herein named in respect of the trust hereunder and each of the
successors appointed as herein provided, is authorized and empowered to appoint
a successor Trustee, to take office upon such appointing Trustee ceasing to act
hereunder.

            4. The Grantor directs that such of JACOB MICHAEL SILVERSTEIN and
MOLLY T. HANNAH SILVERSTEIN ("TRUDY's children") who have attained the age of
majority and who are living, acting unanimously, or if only one TRUDY's children
shall then be living and shall have attained the age of majority, such child


                                       6
<PAGE>

acting alone, are authorized and empowered, at any time and from time to time,
(i) to appoint a successor Trustee or a series of successor Trustees to fill any
vacancy that may then exist or thereafter arise in the office of Trustee
hereunder, (ii) to increase the number of Trustees acting as Trustees of the
trust created herein by appointing one or more additional co-Trustees, and (iii)
to remove any Trustee, successor Trustee or co-Trustee, other than TRUDY
SILVERSTEIN or DENNIS McGILLICUDDY, at any time acting hereunder, PROVIDED,
HOWEVER, that if JACOB MICHAEL SILVERSTEIN or MOLLY T. HANNAH SILVERSTEIN shall
be acting as a Trustee of the trust created herein, he or she shall not vote for
the appointment of a person who is a "related or subordinate party" within the
meaning of Section 672(c) of the Code or any successor provisions thereto with
respect to himself or herself.

      B. Any appointment of a successor Trustee or successor Trustees pursuant
to Paragraph A hereof shall be made by instrument in writing, duly signed and
acknowledged, and may from time to time prior to the qualification of the person
or persons therein designated, be revoked or amended by the person making such
appointment, similarly executed and acknowledged.

      C. In no event shall the Grantor, or any other person who has made a
contribution to the trust created hereunder, be appointed as a successor Trustee
hereunder.

      D. The term "Trustees" wherever used herein, shall be taken to mean the
Trustees for the time being in office; and except as otherwise provided in this
Article THIRD, each such Trustee shall have the same rights, powers, duties,
authority and privileges, whether or not discretionary, as if originally
appointed hereunder.


                                       7
<PAGE>

      E. No Trustee acting hereunder, whether named herein or appointed pursuant
hereto, shall be required to post any bond or other security for the faithful
performance of his or her duties hereunder.

                                     FOURTH

      A. The Trustees named herein hereby assume the trust created by this
Indenture of Trust and undertake to carry out each and every provision hereof.

      B. Any successor Trustee hereunder shall qualify by executing an
instrument in writing, duly signed and acknowledged, expressly agreeing to
assume the trust created by this Indenture of Trust and to carry out each and
every provision thereof.

      C. No Trustee acting hereunder shall incur any liability for any act done
or omitted in the exercise of his or her duties as Trustee in good faith.

                                      FIFTH

      A. Any Trustee acting hereunder, at any time, may resign his or her office
as Trustee by written declaration duly signed by him or her and delivered to the
successor Trustee designated to succeed such Trustee and to his or her
co-Trustees, if any. Such resignation shall become effective upon the date
specified therein.

      B. Any Trustee at any time acting hereunder, any resigned Trustee, and the
executor or administrator of the estate of any deceased Trustee, at any time and
from time to time, may render an account of the acts and transactions of such
Trustee with respect to the income and principal of the trust created hereunder
(from the date of the creation of such trust or from the date of the last
previous account of the Trustee, as the case may be) to The William James
Foundation, Inc. and to the Grantor's then living children of his marriage to
Trudy Silverstein, or if none, to the Grantor's then living descendants of his
marriage to Trudy Silverstein, or if none, to the Grantor's then living


                                       8
<PAGE>

descendants; PROVIDED, HOWEVER, that if any such person to whom an account may
be rendered shall be a minor, any such account may instead be rendered to such
person's parent or legal guardian other than the Grantor or any Trustee
hereunder. The persons hereinabove described shall have full power and
authority, on behalf of all persons who may at any time be interested in such
trust, finally to settle and adjust such account; and upon such account being
settled and adjusted, it shall be final and conclusive upon each and every
person (whether then living or then ascertainable or not) who shall then or
thereafter be or become interested in either the income or the principal of such
trust, with like effect as a judgment of a court having jurisdiction, judicially
settling such account in an action in which the Trustee and all persons having
or claiming to have an interest in the trust were parties.

            Nothing contained in the foregoing paragraph shall be deemed to
preclude a Trustee from having his account judicially settled if such Trustee
shall deem this advisable.

      C. In any proceeding in which all persons interested in the trust
hereunder are required to be served with process, and in which a party to the
proceeding has the same interest as a person under a disability, it shall not be
necessary to serve the person under a disability, it being the Grantor's
intention hereof to avoid the appointment of a guardian ad litem, whenever
possible.

                                      SIXTH

      The Trustees are authorized, in their discretion and notwithstanding the
foregoing provisions of this Indenture of Trust:

      A. In any case in which they are authorized or required to pay or
distribute income or principal to any person who is a minor, to apply the whole
or part of such income or principal, in their absolute discretion, to the
minor's use in any one or more of the following ways:


                                       9
<PAGE>

            1. By depositing the same in a savings account in the minor's name
with any bank or trust company;

            2. By distributing the same to any person (other than a person who
has made a contribution to the trust), including a person acting as Trustee
hereunder, (i) as Custodian for such minor under any Uniform Gifts to Minors Act
or Uniform Transfers to Minors Act authorizing such payment; (ii) with whom the
minor shall at the time reside; or (iii) then having the care or control of such
minor;

            3. By paying the same to such minor or to any other person (other
than a person who has made a contribution to the trust), firm or corporation
(other than a firm or corporation controlled by a person who has made a
contribution to the trust) for the account and benefit of such minor.

            The Trustees, in any of the above cases, shall be under no
obligation to look to the proper application of any such payment or distribution
by the person receiving it. Any payment hereinabove authorized shall be a full
discharge to the Trustees with respect thereto.

            If the Trustees make a distribution to a custodian under
Subparagraph 2 above, they are authorized to make any election or designation
concerning the age at which the minor is to receive the property that may be
made under any applicable Uniform Gifts to Minors Act or Uniform Transfers to
Minors Act.

      B. To defer, in whole or in part, payment or distribution of any property
vesting absolutely in a minor hereunder, until such minor shall have attained
majority; to expend the same or any part thereof, and the income therefrom, for
the benefit of such minor in any manner hereinabove authorized in Paragraph A


                                       10
<PAGE>

hereof, holding the whole or the undistributed portion thereof, and the income
thereon, as a separate and distinct share for such minor, absolutely; and to
transfer, pay over and deliver any remaining principal and income held hereunder
to the minor when he or she attains majority, or to the estate of such minor if
he or she dies prior to attaining majority.

      C. For purposes of this Indenture of Trust, a "minor" shall be deemed to
be a person under the age of twenty-one years and "majority" shall be deemed to
be the age of twenty-one years.

                                     SEVENTH

      A. Subject to Paragraph F of Article FIRST hereof, the Trustees shall
have, with respect to any and all property at any time held by them hereunder
(including property held for the benefit of minors under Article SIXTH hereof)
the following powers, in addition to those conferred by law:

            1. To retain any such property as an investment without regard to
the proportion which such property, or property of a similar character, may bear
to the entire amount of the trust estate, whether or not such property is of the
class in which trustees are authorized by law or any rule of court to invest
trust funds.

            2. To sell any such property at either public or private sale, for
cash or on credit, and to exchange such property.

            3. To grant options for the purchase of any such property, upon any
terms and conditions, for any period or periods of time, even if the period
during which any such option shall be exercisable shall extend beyond the
probable duration of the trust hereunder.


                                       11
<PAGE>

            4. To invest and reinvest in property of any character, real or
personal, foreign or domestic, including, but without limiting the generality of
the foregoing, to acquire both short and long positions, in cash or on margin,
in bonds, notes, debentures, mortgages, common and preferred stock (irrespective
of whether there shall be a public market therefor), shares or interests in
investment trusts, general and limited partnership interests, and interests in
limited liability companies without being limited to the class of securities in
which trustees are authorized by law or any rule of court to invest trust funds
and without regard to the proportion which any such property or property of a
similar character held by the Trustees may bear to the entire amount of the
Trust estate or the speculative or unproductive nature of any such investment or
investments, and the Trustees shall be fully protected in respect of any such
investment made by them in good faith.

            5. To borrow money and give indemnities and guaranties for any
purpose in connection with the administration of the trust created hereunder, to
continue or renew any loan made to the Trustees and in connection therewith to
mortgage, pledge or otherwise encumber any property forming part of the trust
upon any terms and conditions, in any amounts, and for any period of time, even
if for longer than the probable duration of the trust.

            6. To lend any part of the trust, with or without security, in any
amount, upon any terms and conditions, at any reasonable rate of interest, for
any period or periods of time even if longer than the probable duration of the
trust, and to any person, firm or corporation other than the Grantor or the
Grantor's spouse or a firm or corporation owned or controlled by the Grantor
and/or the Grantor's spouse.

            7. To manage any real property held by the Trustees hereunder in the
same manner as if the Trustees were the absolute owners thereof, including,
without limitation, to lease, or grant options to lease, any such real property
for any term or terms, although in excess of any period permitted by statute or
other rule of law (and although any such term may extend beyond the period of
administration of any trust hereunder), without application to any court.


                                       12
<PAGE>

            8. To vote on any securities forming part of any trust by
discretionary proxy or otherwise; to join in or oppose any reorganization,
recapitalization, sale, lease, merger, exchange or consolidation; to exercise
conversion, subscription or other rights, or to sell or abandon such rights; to
receive and hold any securities issued as a result of any of the foregoing
transactions; and generally to take all action in respect of any such securities
as the Trustees might or could do as the absolute owners thereof.

            9. To deposit any securities with voting trustees or protective or
similar committees, to delegate to them discretionary powers, to pay a share of
their expense and compensation, and to charge the same to principal or income as
the Trustees may see fit.

            10. To cause any stocks, bonds, securities, cash or other property
at any time held by the Trustees to be registered in the name of a nominee or
nominees.

            11. To compromise, settle or arbitrate any claim in favor of or
against the trust hereunder.

            12. To determine whether, and, if so, to what extent, premiums on
investments shall be amortized.

            13. To make any distribution hereunder, in whole or in part, in
securities or other property comprising the principal of the trust at the time
of such distribution, and in making such distribution the Trustees shall not be
required to prorate any item of property so distributed among the persons
entitled to such distribution, but shall be authorized and empowered to
distribute different items of property to the distributees.


                                       13
<PAGE>

            14. To maintain on behalf of the trust hereunder one or more custody
accounts with any bank, trust company or brokerage firm wherever located, and to
retain investment counsel, investment advisers, accountants and attorneys
(including any firm of investment counsel, investment advisers, accountants or
attorneys with which the Trustees from time to time acting hereunder shall be
associated or otherwise connected) and to charge the cost thereof to the
principal or income of such trust as the Trustees may deem appropriate.

            15. To delegate any or all of the powers and authorities
hereinbefore conferred upon Trustees in Subparagraphs 1, 2 and 4 hereof, at any
time and from time to time, with respect to all or any portion of the property
held hereunder, to any one or more individual or institutional investment
advisers or investment managers for any period or periods and upon such terms,
conditions and for such compensation as the Trustees shall in their sole and
unreviewable discretion deem appropriate, it being expressly provided that the
Trustees shall have no responsibility or liability for any loss to the trust
hereunder by reason of any action taken or omitted to be taken as a result of
such delegation.

            16. To allocate and credit to income so much or all of any
distribution made by a regulated investment company or mutual fund that is
designated a "dividend" by such company or mutual fund, even though paid from
short-term capital gain or any source other than ordinary income.

            17. To determine whether any dividend, other than an ordinary cash
dividend, declared and paid upon any securities held by the Trustees, whether
payable in cash, in stock (issued by the corporation declaring the same or by
any other corporation), in bonds, or otherwise, shall be treated as and
allocable to principal or income, or partly to principal and partly to income,
and the Trustees shall not be required to treat any particular dividend in the


                                       14
<PAGE>

same manner as previous dividends upon the same or other securities, or to make
any determination on the basis of whether any particular dividend represents in
whole or in part a distribution of earnings or surplus regardless of when earned
or created. This provision shall be in lieu of any statute or applicable rule of
law now or hereafter in effect in the State of Florida.

            18. To exercise any other or further authority or discretion not
hereinabove specifically granted as may from time to time be permitted by
applicable statutes or rules of law, it being the Grantor's intention that the
foregoing powers shall be in addition to and shall not be deemed a limitation
upon such authority and discretion as the Trustees would have but for such
provisions.

      B. Persons dealing with the Trustees shall not be bound to see to the
application of any moneys paid to the Trustees pursuant to their exercise of any
of the foregoing powers.

                                     EIGHTH

      Whenever necessary or appropriate, the use herein of any gender shall be
deemed to include the other gender and the use herein of either the singular or
the plural shall be deemed to include the other.

                                      NINTH

      The trust hereby created shall be irrevocable, and neither the Grantor
nor, except as expressly provided in Subparagraph 1 of Paragraph F of Article
FIRST, any Trustee at any time acting hereunder shall have the right to change,
alter or amend any of the provisions thereof.


                                       15
<PAGE>

                                      TENTH

      The trust created hereunder shall be deemed to be a Florida trust and
shall be governed and construed in all respects by and in accordance with the
laws of the State of Florida. The Trustees, however, are prohibited from
exercising any power or discretion granted under said laws that would be
inconsistent with the qualification of the annuity amount payable under Article
FIRST hereof as a "guaranteed annuity interest" under Section 2522(c)(2)(B) of
the Code and the corresponding regulations.


                                       16
<PAGE>

      IN WITNESS WHEREOF, the Grantor signs, seals, publishes, and declares this
instrument to be an Irrevocable Trust Agreement and, for purpose of
identification, the Grantor has signed his initials on each page other than the
signature page, and the Grantor has signed his name, in the presence of the
persons witnessing this Trust Agreement, at the Grantor's request, on the day
and year first above written.


/s/ Jeffrey R. McCurdy              /s/ Barry Silverstein
- -----------------------------       -----------------------------
Witness                             BARRY SILVERSTEIN


/s/ Randy Arnaud
- -----------------------------
Witness


ACCEPTANCE BY TRUSTEES

                                    /s/ Trudy  Silverstein
                                    -----------------------------
                                    TRUDY SILVERSTEIN


                                    /s/ Dennis McGillicuddy
                                    -----------------------------
                                    DENNIS McGILLICUDDY


                                       17
<PAGE>

STATE OF FLORIDA     )
                     ) SS:
COUNY OF SARASOTA    )

      We, BARRY SILVERSTEIN, Jeffrey R. McCurdy and Randy Arnaud, the Grantor
and the witnesses respectively, whose names are signed to the foregoing
instrument, having been sworn, declared to the undersigned officer that the
Grantor in the presence of witnesses signed the instrument as an Irrevocable
Trust Agreement, that the Grantor signed and that each of the witnesses, in the
presence of the Grantor and in the presence of each other signed the Agreement
as a witness.

                                          /s/ Barry Silverstein
                                          ----------------------
                                          BARRY SILVERSTEIN

                                          /s/ Jeffrey R. McCurdy
                                          ----------------------
                                          Witness

                                          /s/ Randy Arnaud
                                          ----------------------
                                          Witness

      Subscribed and sworn to before me by BARRY SILVERSTEIN, the Grantor, who
is personally known to me or who has produced _____________ as identification,
and by Jeffrey R. McCurdy, a witness, who is personally known to me or who has
produced ______________________ as identification, and by Randy Arnaud, a
witness, who is personally known to me or who has produced
_______________________ as identification, on this 17th day of September, 2003.

                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Notary Public

[NOTARY SEAL]


                                       18
<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 17th day of
September, 2003, by BARRY SILVERSTEIN , who is personally known to me or who has
produced __________________________ as identification.


                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Name: Linnette A. Fauroat
[NOTARY SEAL]


STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 17th day of
September, 2003, by MARK SHALE SILVERSTEIN, who is personally known to me or who
has produced __________________________ as identification.


                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Name: Linnette A. Fauroat
[NOTARY SEAL]

<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 22 day of
September, 2003, by DENNIS McGILLICUDDY, who is personally known to me or who
has produced __________________________ as identification.


                                    /s/ Christen Flenard
                                    -----------------------
                                    Name: Christen Flenard
[NOTARY SEAL]


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-6
<SEQUENCE>6
<FILENAME>ex-6.txt
<TEXT>

                                                                       Exhibit 6


      INDENTURE OF TRUST made as of the 17th day of September, 2003, by and
between BARRY SILVERSTEIN, as Grantor, and MARK SHALE SILVERSTEIN and DENNIS
McGILLICUDDY, as Trustees.

                              W I T N E S S E T H :

      The Grantor hereby transfers, assigns and delivers to the Trustees the
property described in Schedule A annexed hereto (and the Trustees hereby
acknowledges receipt of such property), to hold the same, IN TRUST, to invest
and reinvest, to collect the rents, income and profits thereof, and to dispose
of the same upon the terms hereinafter set forth.

      The trust created herein shall be known as the "MARK S. SILVERSTEIN 2003
CLAT."

                                      FIRST

      A. In each year of the "trust term" (as hereinafter defined), the Trustees
shall make payments aggregating the "annuity amount" (as hereinafter defined) to
The William James Foundation, Inc. (or, if The William James Foundation, Inc.
shall not be a "charitable organization" (as defined in Paragraph G below) at
the time of any payment hereunder, to such one or more charitable organizations
in such amounts or proportions, as the Trustees shall, in their sole and
unreviewable discretion, select and determine).

      B. The "trust term" shall mean the eighteen (18) year period commencing on
the date hereof.

      C. The term "annuity amount" shall be such amount which shall be required
to generate a Federal gift tax charitable deduction equal to the value of the
initial net fair market value of the principal of such trust as finally
determined for Federal gift tax purposes, for the annuity which is to be paid
pursuant to the terms of Paragraph A above, as calculated using (a) the lowest

<PAGE>

Applicable Federal Rate promulgated by the Treasury Department for valuing
annuities which the Trustees may elect to use under Section 7520(a) of the
Internal Revenue Code of 1986, as amended (hereinafter referred to as the
"Code"), and (b) the procedures promulgated by the Treasury Department for
valuing annuities. In determining such initial net fair market value, the assets
of such trust shall be valued at the values finally determined therefor for
Federal estate tax purposes.

            If the initial net fair market value of the property contributed to
the trust created hereunder is incorrectly determined, then, within a reasonable
period after such net fair market value is finally determined, the Trustees
shall (in the case of an undervaluation) pay to or shall (in the case of an
overvaluation) receive from The William James Foundation, Inc. and/or the
charitable organization or charitable organizations, as the case may be, as
shall have received an incorrectly determined annuity amount, and if more than
one, in the proportions in which they shall have shared in such incorrectly
determined annuity amount, an amount equal to the difference between:

                        (a) any annuity amounts actually paid, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period;
            and

                        (b) the annuity amounts payable, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period.


                                       2
<PAGE>

      D. In case of any taxable year of the trust during the trust term which is
for a period of less than twelve months, the annuity amount for such year shall
be prorated on a daily basis.

      E. The Trustees shall make payments under Paragraph A above aggregating
the annuity amount annually. Any payment made during any taxable year of the
trust, or treated (at the election of the Trustees pursuant to Section 642(c)(1)
of the Code) for Federal income tax purposes as having been made during such
year, in satisfaction of the annuity amount, shall first be made from the
ordinary income (including short term capital gain) other than unrelated
business income of the trust for such year, thereafter from capital gains of the
trust for the year, thereafter from unrelated business income of such trust for
the year, thereafter from tax-exempt income and, if and to the extent that such
ordinary income, capital gains and unrelated business income and tax-exempt
income shall be insufficient to pay the annuity amount, then from the principal
of the trust. Any net income not required for the payment of the annuity amount
shall be added to principal.

      F. 1. It is the Grantor's intention that the eighteen (18) year annuity
payable under this Indenture shall qualify as a deductible charitable interest
under Section 2522(c)(2)(B) of the Code and regulations thereunder and that the
Grantor shall be entitled to a charitable deduction for Federal gift tax
purposes for the full value, as of the date hereof, of such annuity. The Grantor
therefore directs that all provisions of this Indenture shall be interpreted and
construed so as to give effect to such intention and that the Trustees shall pay
all payments on account of the annuity amount at such times and in such amounts
and shall also otherwise administer the trust in such manner as may be required
to qualify such annuity for the aforesaid charitable deduction. If such Section
or regulations, or any successor Section or regulations, or any ruling, notice


                                       3
<PAGE>

or other administrative pronouncement issued thereunder, at any time requires
that an instrument creating a "guaranteed annuity interest" within the meaning
of Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder
must contain provisions that are not expressly set forth herein, such provisions
shall be incorporated into this Indenture of Trust by reference and shall be
deemed to be a part of this Indenture of Trust to the same extent as though they
had been expressly set forth herein. The Trustees shall have the power, acting
by majority, to amend the Trust created hereunder in any manner required for the
sole purpose of ensuring that the annuity amount payable under Article FIRST
hereof qualifies as a "guaranteed annuity interest" within the meaning of
Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder.

            2. If the effect of any provision of this Indenture would be to
prevent the allowance of said charitable deduction for such annuity, then the
Grantor directs that such offending provision shall not apply to the trust.

            3. Anything to the contrary in this trust notwithstanding, during
such time as the trust created hereunder shall be a trust described in Section
4947(a)(2) of the Code, the Trustees shall be prohibited from:

                        (i) engaging in any act of "self-dealing," as defined in
            Section 4941(d) of the Code;

                        (ii) retaining any "excess business holdings," as
            defined in Section 4943(c) of the Code;

                        (iii) making any investments so as to subject the trust
            to tax under Section 4944 of the Code, or retaining any investments
            which would subject the trust to such tax if the Trustees had
            acquired such investments; and

                        (iv) making any "taxable expenditures," as defined in
            Section 4945(d) of the Code.


                                       4
<PAGE>

            4. References to Sections of the Code in this Indenture shall also
be deemed to refer to corresponding provisions of any subsequent Federal tax
law.

            5. No additional contribution shall be made to the trust created
hereunder.

            6. Nothing contained in this Indenture shall be construed to
restrict the

Trustees from investing the assets of the trust in a manner which could result
in the annual realization of a reasonable amount of income or gain from the sale
or disposition of trust assets.

      G. The term "charitable organization" as used in this Indenture shall mean
an organization organized and operated exclusively for religious, charitable,
scientific, literary or educational purposes or for the prevention of cruelty to
children or animals as described in Sections 170(c), 501(c)(3) and 2522(a) of
the Code (or any corresponding provisions of the tax laws from time to time in
effect), gifts to which are deductible for Federal income and gift tax purposes.

                                     SECOND

            Upon the termination of the Term, the trust estate then remaining
(after making any payments required by Paragraph A of Article FIRST) shall be
paid over and distributed to such person or persons (including MARK SHALE
SILVERSTEIN, the estate of MARK SHALE SILVERSTEIN, his creditors and the
creditors of his estate) in such amounts or proportions and upon such estates
(whether in trust or otherwise) as MARK SHALE SILVERSTEIN shall appoint by
instrument in writing, duly signed and acknowledged by him and delivered to a
then acting Trustee (other than himself) during his lifetime, or in his Last
Will and Testament, by specific reference to this Indenture of Trust. The
Grantor directs that any portion or all of the trust estate that is not
effectively appointed shall be paid over and distributed to MARK SHALE


                                       5
<PAGE>

SILVERSTEIN, absolutely, or if he is not then living, to his then living issue,
per stirpes, absolutely, and in default of such issue, to the then living issue
of the Grantor from his marriage to Lois Silverstein, per stirpes, or if none,
to the then living issue of the Grantor, per stirpes, absolutely.

                                      THIRD

      A. 1. If DENNIS McGILLICUDDY shall cease to act as a trustee hereof, the
following are appointed as successor Trustees, to take office, singly, in the
order named: STEPHEN BLECHNER and JAMES B. SHEIN.

            2. The last to act of the Trustees (including substitutes and/or
successors) herein named in respect of the trust hereunder and each of the
successors appointed as herein provided, is authorized and empowered to appoint
a successor Trustee, to take office upon such appointing Trustee ceasing to act
hereunder.

            3. The Grantor directs that any two of MARK SHALE SILVERSTEIN, SUSAN
SILVERSTEIN POTTER and THOMAS BENJAMIN SILVERSTEIN, or if only one of them shall
then be living and competent, such one, acting alone, are authorized and
empowered, at any time and from time to time, (i) to appoint a successor Trustee
or a series of successor Trustees to fill any vacancy that may then exist or
thereafter arise in the office of Trustee hereunder, (ii) to increase the number
of Trustees acting as Trustees of the trust created herein by appointing one or
more additional co-Trustees, and (iii) to remove any Trustee, successor Trustee
or co-Trustee, other than MARK SHALE SILVERSTEIN or DENNIS McGILLICUDDY, at any
time acting hereunder, PROVIDED, HOWEVER, that if MARK SHALE SILVERSTEIN shall
be acting as a Trustee of the trust created herein, he shall not vote for the
appointment of a person who is a "related or subordinate party" within the
meaning of Section 672(c) of the Code or any successor provisions thereto with
respect to himself.


                                       6
<PAGE>

      B. Any appointment of a successor Trustee or successor Trustees pursuant
to Paragraph A hereof shall be made by instrument in writing, duly signed and
acknowledged, and may from time to time prior to the qualification of the person
or persons therein designated, be revoked or amended by the person making such
appointment, similarly executed and acknowledged.

      C. In no event shall the Grantor, or any other person who has made a
contribution to the trust created hereunder, be appointed as a successor Trustee
hereunder.

      D. The term "Trustees" wherever used herein, shall be taken to mean the
Trustees for the time being in office; and except as otherwise provided in this
Article THIRD, each such Trustee shall have the same rights, powers, duties,
authority and privileges, whether or not discretionary, as if originally
appointed hereunder.

      E. No Trustee acting hereunder, whether named herein or appointed pursuant
hereto, shall be required to post any bond or other security for the faithful
performance of his or her duties hereunder.

                                     FOURTH

      A. The Trustees named herein hereby assume the trust created by this
Indenture of Trust and undertake to carry out each and every provision hereof.

      B. Any successor Trustee hereunder shall qualify by executing an
instrument in writing, duly signed and acknowledged, expressly agreeing to
assume the trust created by this Indenture of Trust and to carry out each and
every provision thereof.


                                       7
<PAGE>

      C. No Trustee acting hereunder shall incur any liability for any act done
or omitted in the exercise of his or her duties as Trustee in good faith.

                                      FIFTH

      A. Any Trustee acting hereunder, at any time, may resign his or her office
as Trustee by written declaration duly signed by him or her and delivered to the
successor Trustee designated to succeed such Trustee and to his or her
co-Trustees, if any. Such resignation shall become effective upon the date
specified therein.

      B. Any Trustee at any time acting hereunder, any resigned Trustee, and the
executor or administrator of the estate of any deceased Trustee, at any time and
from time to time, may render an account of the acts and transactions of such
Trustee with respect to the income and principal of the trust created hereunder
(from the date of the creation of such trust or from the date of the last
previous account of the Trustee, as the case may be) to The William James
Foundation, Inc. and to Mark Shale Silverstein, or if Mark Shale Silverstein
shall not then be living, to the then living issue of Mark Shale Silverstein, or
if none, to the Grantor's then living children of his marriage to Lois
Silverstein, or if none, to the Grantor's then living descendants of his
marriage to Lois Silverstein, or if none, to the Grantor's then living issue;
PROVIDED, HOWEVER, that if any such person to whom an account may be rendered
shall be a minor, any such account may instead be rendered to such person's
parent or legal guardian other than the Grantor or any Trustee hereunder. The
persons hereinabove described shall have full power and authority, on behalf of
all persons who may at any time be interested in such trust, finally to settle
and adjust such account; and upon such account being settled and adjusted, it
shall be final and conclusive upon each and every person (whether then living or
then ascertainable or not) who shall then or thereafter be or become interested
in either the income or the principal of such trust, with like effect as a


                                       8
<PAGE>

judgment of a court having jurisdiction, judicially settling such account in an
action in which the Trustee and all persons having or claiming to have an
interest in the trust were parties.

            Nothing contained in the foregoing paragraph shall be deemed to
preclude a Trustee from having his account judicially settled if such Trustee
shall deem this advisable.

      C. In any proceeding in which all persons interested in the trust
hereunder are required to be served with process, and in which a party to the
proceeding has the same interest as a person under a disability, it shall not be
necessary to serve the person under a disability, it being the Grantor's
intention hereof to avoid the appointment of a guardian ad litem, whenever
possible.

                                      SIXTH

      The Trustees are authorized, in their discretion and notwithstanding the
foregoing provisions of this Indenture of Trust:

      A. In any case in which they are authorized or required to pay or
distribute income or principal to any person who is a minor, to apply the whole
or part of such income or principal, in their absolute discretion, to the
minor's use in any one or more of the following ways:

      1. By depositing the same in a savings account in the minor's name with
any bank or trust company;

      2. By distributing the same to any person (other than a person who has
made a contribution to the trust), including a person acting as Trustee
hereunder, (i) as Custodian for such minor under any Uniform Gifts to Minors Act
or Uniform Transfers to Minors Act authorizing such payment; (ii) with whom the
minor shall at the time reside; or (iii) then having the care or control of such
minor;


                                       9
<PAGE>

            3. By paying the same to such minor or to any other person (other
than a person who has made a contribution to the trust), firm or corporation
(other than a firm or corporation controlled by a person who has made a
contribution to the trust) for the account and benefit of such minor.

            The Trustees, in any of the above cases, shall be under no
obligation to look to the proper application of any such payment or distribution
by the person receiving it. Any payment hereinabove authorized shall be a full
discharge to the Trustees with respect thereto.

            If the Trustees make a distribution to a custodian under
Subparagraph 2 above, they are authorized to make any election or designation
concerning the age at which the minor is to receive the property that may be
made under any applicable Uniform Gifts to Minors Act or Uniform Transfers to
Minors Act.

      B. To defer, in whole or in part, payment or distribution of any property
vesting absolutely in a minor hereunder, until such minor shall have attained
majority; to expend the same or any part thereof, and the income therefrom, for
the benefit of such minor in any manner hereinabove authorized in Paragraph A
hereof, holding the whole or the undistributed portion thereof, and the income
thereon, as a separate and distinct share for such minor, absolutely; and to
transfer, pay over and deliver any remaining principal and income held hereunder
to the minor when he or she attains majority, or to the estate of such minor if
he or she dies prior to attaining majority.


                                       10
<PAGE>

      C. For purposes of this Indenture of Trust, a "minor" shall be deemed to
be a person under the age of twenty-one years and "majority" shall be deemed to
be the age of twenty-one years.

                                     SEVENTH

      A. Subject to Paragraph F of Article FIRST hereof, the Trustees shall
have, with respect to any and all property at any time held by them hereunder
(including property held for the benefit of minors under Article SIXTH hereof)
the following powers, in addition to those conferred by law:

            1. To retain any such property as an investment without regard to
the proportion which such property, or property of a similar character, may bear
to the entire amount of the trust estate, whether or not such property is of the
class in which trustees are authorized by law or any rule of court to invest
trust funds.

            2. To sell any such property at either public or private sale, for
cash or on credit, and to exchange such property.

            3. To grant options for the purchase of any such property, upon any
terms and conditions, for any period or periods of time, even if the period
during which any such option shall be exercisable shall extend beyond the
probable duration of the trust hereunder.

            4. To invest and reinvest in property of any character, real or
personal, foreign or domestic, including, but without limiting the generality of
the foregoing, to acquire both short and long positions, in cash or on margin,
in bonds, notes, debentures, mortgages, common and preferred stock (irrespective
of whether there shall be a public market therefor), shares or interests in
investment trusts, general and limited partnership interests, and interests in
limited liability companies without being limited to the class of securities in
which trustees are authorized by law or any rule of court to invest trust funds


                                       11
<PAGE>

and without regard to the proportion which any such property or property of a
similar character held by the Trustees may bear to the entire amount of the
Trust estate or the speculative or unproductive nature of any such investment or
investments, and the Trustees shall be fully protected in respect of any such
investment made by them in good faith.

            5. To borrow money and give indemnities and guaranties for any
purpose in connection with the administration of the trust created hereunder, to
continue or renew any loan made to the Trustees and in connection therewith to
mortgage, pledge or otherwise encumber any property forming part of the trust
upon any terms and conditions, in any amounts, and for any period of time, even
if for longer than the probable duration of the trust.

            6. To lend any part of the trust, with or without security, in any
amount, upon any terms and conditions, at any reasonable rate of interest, for
any period or periods of time even if longer than the probable duration of the
trust, and to any person, firm or corporation other than the Grantor or the
Grantor's spouse or a firm or corporation owned or controlled by the Grantor
and/or the Grantor's spouse.

            7. To manage any real property held by the Trustees hereunder in the
same manner as if the Trustees were the absolute owners thereof, including,
without limitation, to lease, or grant options to lease, any such real property
for any term or terms, although in excess of any period permitted by statute or
other rule of law (and although any such term may extend beyond the period of
administration of any trust hereunder), without application to any court.

            8. To vote on any securities forming part of any trust by
discretionary proxy or otherwise; to join in or oppose any reorganization,
recapitalization, sale, lease, merger, exchange or consolidation; to exercise
conversion, subscription or other rights, or to sell or abandon such rights; to


                                       12
<PAGE>

receive and hold any securities issued as a result of any of the foregoing
transactions; and generally to take all action in respect of any such securities
as the Trustees might or could do as the absolute owners thereof.

            9. To deposit any securities with voting trustees or protective or
similar committees, to delegate to them discretionary powers, to pay a share of
their expense and compensation, and to charge the same to principal or income as
the Trustees may see fit.

            10. To cause any stocks, bonds, securities, cash or other property
at any time held by the Trustees to be registered in the name of a nominee or
nominees.

            11. To compromise, settle or arbitrate any claim in favor of or
against the trust hereunder.

            12. To determine whether, and, if so, to what extent, premiums on
investments shall be amortized.

            13. To make any distribution hereunder, in whole or in part, in
securities or other property comprising the principal of the trust at the time
of such distribution, and in making such distribution the Trustees shall not be
required to prorate any item of property so distributed among the persons
entitled to such distribution, but shall be authorized and empowered to
distribute different items of property to the distributees.

            14. To maintain on behalf of the trust hereunder one or more custody
accounts with any bank, trust company or brokerage firm wherever located, and to
retain investment counsel, investment advisers, accountants and attorneys
(including any firm of investment counsel, investment advisers, accountants or
attorneys with which the Trustees from time to time acting hereunder shall be
associated or otherwise connected) and to charge the cost thereof to the
principal or income of such trust as the Trustees may deem appropriate.


                                       13
<PAGE>

            15. To delegate any or all of the powers and authorities
hereinbefore conferred upon Trustees in Subparagraphs 1, 2 and 4 hereof, at any
time and from time to time, with respect to all or any portion of the property
held hereunder, to any one or more individual or institutional investment
advisers or investment managers for any period or periods and upon such terms,
conditions and for such compensation as the Trustees shall in their sole and
unreviewable discretion deem appropriate, it being expressly provided that the
Trustees shall have no responsibility or liability for any loss to the trust
hereunder by reason of any action taken or omitted to be taken as a result of
such delegation.

            16. To allocate and credit to income so much or all of any
distribution made by a regulated investment company or mutual fund that is
designated a "dividend" by such company or mutual fund, even though paid from
short-term capital gain or any source other than ordinary income.

            17. To determine whether any dividend, other than an ordinary cash
dividend, declared and paid upon any securities held by the Trustees, whether
payable in cash, in stock (issued by the corporation declaring the same or by
any other corporation), in bonds, or otherwise, shall be treated as and
allocable to principal or income, or partly to principal and partly to income,
and the Trustees shall not be required to treat any particular dividend in the
same manner as previous dividends upon the same or other securities, or to make
any determination on the basis of whether any particular dividend represents in
whole or in part a distribution of earnings or surplus regardless of when earned
or created. This provision shall be in lieu of any statute or applicable rule of
law now or hereafter in effect in the State of Florida.


                                       14
<PAGE>

            18. To exercise any other or further authority or discretion not
hereinabove specifically granted as may from time to time be permitted by
applicable statutes or rules of law, it being the Grantor's intention that the
foregoing powers shall be in addition to and shall not be deemed a limitation
upon such authority and discretion as the Trustees would have but for such
provisions.

      B. Persons dealing with the Trustees shall not be bound to see to the
application of any moneys paid to the Trustees pursuant to their exercise of any
of the foregoing powers.

                                     EIGHTH

      Whenever necessary or appropriate, the use herein of any gender shall be
deemed to include the other gender and the use herein of either the singular or
the plural shall be deemed to include the other.

                                      NINTH

      The trust hereby created shall be irrevocable, and neither the Grantor
nor, except as expressly provided in Subparagraph 1 of Paragraph F of Article
FIRST, any Trustee at any time acting hereunder shall have the right to change,
alter or amend any of the provisions thereof.

                                      TENTH

      The trust created hereunder shall be deemed to be a Florida trust and
shall be governed and construed in all respects by and in accordance with the
laws of the State of Florida. The Trustees, however, is prohibited from
exercising any power or discretion granted under said laws that would be
inconsistent with the qualification of the annuity amount payable under Article
FIRST hereof as a "guaranteed annuity interest" under Section 2522(c)(2)(B) of
the Code and the corresponding regulations.


                                       15
<PAGE>

      IN WITNESS WHEREOF, the Grantor signs, seals, publishes, and declares this
instrument to be an Irrevocable Trust Agreement and, for purpose of
identification, the Grantor has signed his initials on each page other than the
signature page, and the Grantor has signed his name, in the presence of the
persons witnessing this Trust Agreement, at the Grantor's request, on the day
and year first above written.

/s/ Jeffrey R. McCurdy              /s/ Barry Silverstein
- -----------------------------       -----------------------------
Witness                             BARRY SILVERSTEIN


/s/ Randy Arnaud
- -----------------------------
Witness


ACCEPTANCE BY TRUSTEES


                                    /s/ Mark Shale Silverstein
                                    -----------------------------
                                    MARK SHALE SILVERSTEIN


                                    /s/ Dennis McGillicuddy
                                    -----------------------------
                                    DENNIS McGILLICUDDY


                                       16
<PAGE>

STATE OF FLORIDA     )
                     ) SS:
COUNY OF SARASOTA    )

      We, BARRY SILVERSTEIN, Jeffrey R. McCurdy and Randy Arnaud, the Grantor
and the witnesses respectively, whose names are signed to the foregoing
instrument, having been sworn, declared to the undersigned officer that the
Grantor in the presence of witnesses signed the instrument as an Irrevocable
Trust Agreement, that the Grantor signed and that each of the witnesses, in the
presence of the Grantor and in the presence of each other signed the Agreement
as a witness.


                                          /s/ Barry Silverstein
                                          ----------------------
                                          BARRY SILVERSTEIN

                                          /s/ Jeffrey R. McCurdy
                                          ----------------------
                                          Witness

                                          /s/ Randy Arnaud
                                          ----------------------
                                          Witness

      Subscribed and sworn to before me by BARRY SILVERSTEIN, the Grantor, who
is personally known to me or who has produced _____________ as identification,
and by Jeffrey R. McCurdy, a witness, who is personally known to me or who has
produced ______________________ as identification, and by Randy Arnaud, a
witness, who is personally known to me or who has produced
_______________________ as identification, on this 17th day of September, 2003.

                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Notary Public

[NOTARY SEAL]


                                       17
<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 17th day of
September, 2003, by BARRY SILVERSTEIN , who is personally known to me or who has
produced __________________________ as identification.


                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Name: Linnette A. Fauroat
[NOTARY SEAL]


STATE OF ENGLAND            )
                            ) ss.:
CITY OF LONDON              )

      The foregoing instrument was acknowledged before me this 2nd day of
October, 2003, by MARK SHALE SILVERSTEIN, who is personally known to me or who
has produced US Passport 700913975 as identification.


                                    /s/ Barrington William Hooke
                                    -----------------------
                                    Name: BARRINGTON WILLIAM HOOKE
                                          NOTARY PUBLIC, LONDON

                                        [NOTARY SEAL]

<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 22 day of
September, 2003, by DENNIS McGILLICUDDY, who is personally known to me or who
has produced __________________________ as identification.


                                    /s/ Christen Flenard
                                    -----------------------
                                    Name: Christen Flenard
[NOTARY SEAL]


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-7
<SEQUENCE>7
<FILENAME>ex-7.txt
<TEXT>

                                                                       Exhibit 7


      INDENTURE OF TRUST made as of the 17th day of September, 2003, by and
between BARRY SILVERSTEIN, as Grantor, and MARK SHALE SILVERSTEIN and DENNIS
McGILLICUDDY, as Trustees.

                              W I T N E S S E T H :

      The Grantor hereby transfers, assigns and delivers to the Trustees the
property described in Schedule A annexed hereto (and the Trustees hereby
acknowledges receipt of such property), to hold the same, IN TRUST, to invest
and reinvest, to collect the rents, income and profits thereof, and to dispose
of the same upon the terms hereinafter set forth.

      The trust created herein shall be known as the "SUSAN S. POTTER 2003
CLAT."

                                      FIRST

      A. In each year of the "trust term" (as hereinafter defined), the Trustees
shall make payments aggregating the "annuity amount" (as hereinafter defined) to
The William James Foundation, Inc. (or, if The William James Foundation, Inc.
shall not be a "charitable organization" (as defined in Paragraph G below) at
the time of any payment hereunder, to such one or more charitable organizations
in such amounts or proportions, as the Trustees shall, in their sole and
unreviewable discretion, select and determine).

      B. The "trust term" shall mean the twenty (20) year period commencing on
the date hereof.

      C. The term "annuity amount" shall be such amount which shall be required
to generate a Federal gift tax charitable deduction equal to the value of the
initial net fair market value of the principal of such trust as finally
determined for Federal gift tax purposes, for the annuity which is to be paid
pursuant to the terms of Paragraph A above, as calculated using (a) the lowest

<PAGE>

Applicable Federal Rate promulgated by the Treasury Department for valuing
annuities which the Trustees may elect to use under Section 7520(a) of the
Internal Revenue Code of 1986, as amended (hereinafter referred to as the
"Code"), and (b) the procedures promulgated by the Treasury Department for
valuing annuities. In determining such initial net fair market value, the assets
of such trust shall be valued at the values finally determined therefor for
Federal estate tax purposes.

            If the initial net fair market value of the property contributed to
the trust created hereunder is incorrectly determined, then, within a reasonable
period after such net fair market value is finally determined, the Trustees
shall (in the case of an undervaluation) pay to or shall (in the case of an
overvaluation) receive from The William James Foundation, Inc. and/or the
charitable organization or charitable organizations, as the case may be, as
shall have received an incorrectly determined annuity amount, and if more than
one, in the proportions in which they shall have shared in such incorrectly
determined annuity amount, an amount equal to the difference between:

                        (a) any annuity amounts actually paid, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period;
            and

                        (b) the annuity amounts payable, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period.


                                       2
<PAGE>

      D. In case of any taxable year of the trust during the trust term which is
for a period of less than twelve months, the annuity amount for such year shall
be prorated on a daily basis.

      E. The Trustees shall make payments under Paragraph A above aggregating
the annuity amount annually. Any payment made during any taxable year of the
trust, or treated (at the election of the Trustees pursuant to Section 642(c)(1)
of the Code) for Federal income tax purposes as having been made during such
year, in satisfaction of the annuity amount, shall first be made from the
ordinary income (including short term capital gain) other than unrelated
business income of the trust for such year, thereafter from capital gains of the
trust for the year, thereafter from unrelated business income of such trust for
the year, thereafter from tax-exempt income and, if and to the extent that such
ordinary income, capital gains and unrelated business income and tax-exempt
income shall be insufficient to pay the annuity amount, then from the principal
of the trust. Any net income not required for the payment of the annuity amount
shall be added to principal.

      F. 1. It is the Grantor's intention that the twenty (20) year annuity
payable under this Indenture shall qualify as a deductible charitable interest
under Section 2522(c)(2)(B) of the Code and regulations thereunder and that the
Grantor shall be entitled to a charitable deduction for Federal gift tax
purposes for the full value, as of the date hereof, of such annuity. The Grantor
therefore directs that all provisions of this Indenture shall be interpreted and
construed so as to give effect to such intention and that the Trustees shall pay
all payments on account of the annuity amount at such times and in such amounts
and shall also otherwise administer the trust in such manner as may be required
to qualify such annuity for the aforesaid charitable deduction. If such Section
or regulations, or any successor Section or regulations, or any ruling, notice


                                       3
<PAGE>

or other administrative pronouncement issued thereunder, at any time requires
that an instrument creating a "guaranteed annuity interest" within the meaning
of Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder
must contain provisions that are not expressly set forth herein, such provisions
shall be incorporated into this Indenture of Trust by reference and shall be
deemed to be a part of this Indenture of Trust to the same extent as though they
had been expressly set forth herein. The Trustees shall have the power, acting
by majority, to amend the Trust created hereunder in any manner required for the
sole purpose of ensuring that the annuity amount payable under Article FIRST
hereof qualifies as a "guaranteed annuity interest" within the meaning of
Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder.

            2. If the effect of any provision of this Indenture would be to
prevent the allowance of said charitable deduction for such annuity, then the
Grantor directs that such offending provision shall not apply to the trust.

            3. Anything to the contrary in this trust notwithstanding, during
such time as the trust created hereunder shall be a trust described in Section
4947(a)(2) of the Code, the Trustees shall be prohibited from:

                        (i) engaging in any act of "self-dealing," as defined in
            Section 4941(d) of the Code;

                        (ii) retaining any "excess business holdings," as
            defined in Section 4943(c) of the Code;

                        (iii) making any investments so as to subject the trust
            to tax under Section 4944 of the Code, or retaining any investments
            which would subject the trust to such tax if the Trustees had
            acquired such investments; and

                        (iv) making any "taxable expenditures," as defined in
            Section 4945(d) of the Code.


                                       4
<PAGE>

            4. References to Sections of the Code in this Indenture shall also
be deemed to refer to corresponding provisions of any subsequent Federal tax
law.

            5. No additional contribution shall be made to the trust created
hereunder.

            6. Nothing contained in this Indenture shall be construed to
restrict the

Trustees from investing the assets of the trust in a manner which could result
in the annual realization of a reasonable amount of income or gain from the sale
or disposition of trust assets.

      G. The term "charitable organization" as used in this Indenture shall mean
an organization organized and operated exclusively for religious, charitable,
scientific, literary or educational purposes or for the prevention of cruelty to
children or animals as described in Sections 170(c), 501(c)(3) and 2522(a) of
the Code (or any corresponding provisions of the tax laws from time to time in
effect), gifts to which are deductible for Federal income and gift tax purposes.

                                     SECOND

            Upon the termination of the Term, the trust estate then remaining
(after making any payments required by Paragraph A of Article FIRST) shall be
paid over and distributed to such person or persons (including SUSAN SILVERSTEIN
POTTER, the estate of SUSAN SILVERSTEIN POTTER, her creditors and the creditors
of her estate) in such amounts or proportions and upon such estates (whether in
trust or otherwise) as SUSAN SILVERSTEIN POTTER shall appoint by instrument in
writing, duly signed and acknowledged by her and delivered to a then acting
Trustee (other than herself) during her lifetime, or in her Last Will and
Testament, by specific reference to this Indenture of Trust. The Grantor directs
that any portion or all of the trust estate that is not effectively appointed
shall be paid over and distributed to SUSAN SILVERSTEIN POTTER, absolutely, or


                                       5
<PAGE>

if she is not then living, to her then living issue, per stirpes, absolutely,
and in default of such issue, to the then living issue of the Grantor from his
marriage to Lois Silverstein, per stirpes, or if none, to the then living issue
of the Grantor, per stirpes, absolutely.

                                      THIRD

      A. 1. If DENNIS McGILLICUDDY shall cease to act as a trustee hereof, the
following are appointed as successor Trustees, to take office, singly, in the
order named: STEPHEN BLECHNER and JAMES B. SHEIN.

            2. Upon attaining the age of 40 years, SUSAN SILVERSTEIN POTTER
shall be allowed to qualify as a co-Trustee to act contemporaneously with the
then acting Trustees of the trust created hereunder, PROVIDED, HOWEVER, that if
SUSAN SILVERSTEIN POTTER shall so qualify, MARK SHALE SILVERSTEIN shall
immediately cease to act as a Trustee hereof.

            3. The last to act of the Trustees (including substitutes and/or
successors) herein named in respect of the trust hereunder and each of the
successors appointed as herein provided, is authorized and empowered to appoint
a successor Trustee, to take office upon such appointing Trustee ceasing to act
hereunder.

            4. The Grantor directs that any two of SUSAN SILVERSTEIN POTTER,
MARK SHALE SILVERSTEIN, and THOMAS BENJAMIN SILVERSTEIN, or if only one of them
shall then be living and competent, such one, acting alone, are authorized and
empowered, at any time and from time to time, (i) to appoint a successor Trustee
or a series of successor Trustees to fill any vacancy that may then exist or
thereafter arise in the office of Trustee hereunder, (ii) to increase the number
of Trustees acting as Trustees of the trust created herein by appointing one or
more additional co-Trustees, and (iii) to remove any Trustee, successor Trustee


                                       6
<PAGE>

or co-Trustee, other than SUSAN SILVERSTEIN POTTER, MARK SHALE SILVERSTEIN or
DENNIS McGILLICUDDY, at any time acting hereunder, PROVIDED, HOWEVER, that if
SUSAN SILVERSTEIN POTTER shall be acting as a Trustee of the trust created
herein, she shall not vote for the appointment of a person who is a "related or
subordinate party" within the meaning of Section 672(c) of the Code or any
successor provisions thereto with respect to herself.

      B. Any appointment of a successor Trustee or successor Trustees pursuant
to Paragraph A hereof shall be made by instrument in writing, duly signed and
acknowledged, and may from time to time prior to the qualification of the person
or persons therein designated, be revoked or amended by the person making such
appointment, similarly executed and acknowledged.

      C. In no event shall the Grantor, or any other person who has made a
contribution to the trust created hereunder, be appointed as a successor Trustee
hereunder.

      D. The term "Trustees" wherever used herein, shall be taken to mean the
Trustees for the time being in office; and except as otherwise provided in this
Article THIRD, each such Trustee shall have the same rights, powers, duties,
authority and privileges, whether or not discretionary, as if originally
appointed hereunder.

      E. No Trustee acting hereunder, whether named herein or appointed pursuant
hereto, shall be required to post any bond or other security for the faithful
performance of his or her duties hereunder.

                                     FOURTH

      A. The Trustees named herein hereby assume the trust created by this
Indenture of Trust and undertake to carry out each and every provision hereof.


                                       7
<PAGE>

      B. Any successor Trustee hereunder shall qualify by executing an
instrument in writing, duly signed and acknowledged, expressly agreeing to
assume the trust created by this Indenture of Trust and to carry out each and
every provision thereof.

      C. No Trustee acting hereunder shall incur any liability for any act done
or omitted in the exercise of his or her duties as Trustee in good faith.

                                      FIFTH

      A. Any Trustee acting hereunder, at any time, may resign his or her office
as Trustee by written declaration duly signed by him or her and delivered to the
successor Trustee designated to succeed such Trustee and to his or her
co-Trustees, if any. Such resignation shall become effective upon the date
specified therein.

      B. Any Trustee at any time acting hereunder, any resigned Trustee, and the
executor or administrator of the estate of any deceased Trustee, at any time and
from time to time, may render an account of the acts and transactions of such
Trustee with respect to the income and principal of the trust created hereunder
(from the date of the creation of such trust or from the date of the last
previous account of the Trustee, as the case may be) to The William James
Foundation, Inc. and to Susan Silverstein Potter, or if Susan Silverstein Potter
shall not then be living, to the then living issue of Susan Silverstein Potter,
or if none, to the Grantor's then living children of his marriage to Lois
Silverstein, or if none, to the Grantor's then living descendants of his
marriage to Lois Silverstein, or if none, to the Grantor's then living issue;
PROVIDED, HOWEVER, that if any such person to whom an account may be rendered
shall be a minor, any such account may instead be rendered to such person's
parent or legal guardian other than the Grantor or any Trustee hereunder. The
persons hereinabove described shall have full power and authority, on behalf of


                                       8
<PAGE>

all persons who may at any time be interested in such trust, finally to settle
and adjust such account; and upon such account being settled and adjusted, it
shall be final and conclusive upon each and every person (whether then living or
then ascertainable or not) who shall then or thereafter be or become interested
in either the income or the principal of such trust, with like effect as a
judgment of a court having jurisdiction, judicially settling such account in an
action in which the Trustee and all persons having or claiming to have an
interest in the trust were parties.

            Nothing contained in the foregoing paragraph shall be deemed to
preclude a Trustee from having his account judicially settled if such Trustee
shall deem this advisable.

      C. In any proceeding in which all persons interested in the trust
hereunder are required to be served with process, and in which a party to the
proceeding has the same interest as a person under a disability, it shall not be
necessary to serve the person under a disability, it being the Grantor's
intention hereof to avoid the appointment of a guardian ad litem, whenever
possible.

                                      SIXTH

      The Trustees are authorized, in their discretion and notwithstanding the
foregoing provisions of this Indenture of Trust:

      A. In any case in which they are authorized or required to pay or
distribute income or principal to any person who is a minor, to apply the whole
or part of such income or principal, in their absolute discretion, to the
minor's use in any one or more of the following ways:

            1. By depositing the same in a savings account in the minor's name
with any bank or trust company;


                                       9
<PAGE>

            2. By distributing the same to any person (other than a person who
has made a contribution to the trust), including a person acting as Trustee
hereunder, (i) as Custodian for such minor under any Uniform Gifts to Minors Act
or Uniform Transfers to Minors Act authorizing such payment; (ii) with whom the
minor shall at the time reside; or (iii) then having the care or control of such
minor;

            3. By paying the same to such minor or to any other person (other
than a person who has made a contribution to the trust), firm or corporation
(other than a firm or corporation controlled by a person who has made a
contribution to the trust) for the account and benefit of such minor.

            The Trustees, in any of the above cases, shall be under no
obligation to look to the proper application of any such payment or distribution
by the person receiving it. Any payment hereinabove authorized shall be a full
discharge to the Trustees with respect thereto.

            If the Trustees make a distribution to a custodian under
Subparagraph 2 above, they are authorized to make any election or designation
concerning the age at which the minor is to receive the property that may be
made under any applicable Uniform Gifts to Minors Act or Uniform Transfers to
Minors Act.

      B. To defer, in whole or in part, payment or distribution of any property
vesting absolutely in a minor hereunder, until such minor shall have attained
majority; to expend the same or any part thereof, and the income therefrom, for
the benefit of such minor in any manner hereinabove authorized in Paragraph A
hereof, holding the whole or the undistributed portion thereof, and the income
thereon, as a separate and distinct share for such minor, absolutely; and to
transfer, pay over and deliver any remaining principal and income held hereunder
to the minor when he or she attains majority, or to the estate of such minor if
he or she dies prior to attaining majority.


                                       10
<PAGE>

      C. For purposes of this Indenture of Trust, a "minor" shall be deemed to
be a person under the age of twenty-one years and "majority" shall be deemed to
be the age of twenty-one years.

                                     SEVENTH

      A. Subject to Paragraph F of Article FIRST hereof, the Trustees shall
have, with respect to any and all property at any time held by them hereunder
(including property held for the benefit of minors under Article SIXTH hereof)
the following powers, in addition to those conferred by law:

            1. To retain any such property as an investment without regard to
the proportion which such property, or property of a similar character, may bear
to the entire amount of the trust estate, whether or not such property is of the
class in which trustees are authorized by law or any rule of court to invest
trust funds.

            2. To sell any such property at either public or private sale, for
cash or on credit, and to exchange such property.

            3. To grant options for the purchase of any such property, upon any
terms and conditions, for any period or periods of time, even if the period
during which any such option shall be exercisable shall extend beyond the
probable duration of the trust hereunder.

            4. To invest and reinvest in property of any character, real or
personal, foreign or domestic, including, but without limiting the generality of
the foregoing, to acquire both short and long positions, in cash or on margin,
in bonds, notes, debentures, mortgages, common and preferred stock (irrespective
of whether there shall be a public market therefor), shares or interests in
investment trusts, general and limited partnership interests, and interests in
limited liability companies without being limited to the class of securities in
which trustees are authorized by law or any rule of court to invest trust funds


                                       11
<PAGE>

and without regard to the proportion which any such property or property of a
similar character held by the Trustees may bear to the entire amount of the
Trust estate or the speculative or unproductive nature of any such investment or
investments, and the Trustees shall be fully protected in respect of any such
investment made by them in good faith.

            5. To borrow money and give indemnities and guaranties for any
purpose in connection with the administration of the trust created hereunder, to
continue or renew any loan made to the Trustees and in connection therewith to
mortgage, pledge or otherwise encumber any property forming part of the trust
upon any terms and conditions, in any amounts, and for any period of time, even
if for longer than the probable duration of the trust.

            6. To lend any part of the trust, with or without security, in any
amount, upon any terms and conditions, at any reasonable rate of interest, for
any period or periods of time even if longer than the probable duration of the
trust, and to any person, firm or corporation other than the Grantor or the
Grantor's spouse or a firm or corporation owned or controlled by the Grantor
and/or the Grantor's spouse.

            7. To manage any real property held by the Trustees hereunder in the
same manner as if the Trustees were the absolute owners thereof, including,
without limitation, to lease, or grant options to lease, any such real property
for any term or terms, although in excess of any period permitted by statute or
other rule of law (and although any such term may extend beyond the period of
administration of any trust hereunder), without application to any court.

            8. To vote on any securities forming part of any trust by
discretionary proxy or otherwise; to join in or oppose any reorganization,
recapitalization, sale, lease, merger, exchange or consolidation; to exercise


                                       12
<PAGE>

conversion, subscription or other rights, or to sell or abandon such rights; to
receive and hold any securities issued as a result of any of the foregoing
transactions; and generally to take all action in respect of any such securities
as the Trustees might or could do as the absolute owners thereof.

            9. To deposit any securities with voting trustees or protective or
similar committees, to delegate to them discretionary powers, to pay a share of
their expense and compensation, and to charge the same to principal or income as
the Trustees may see fit.

            10. To cause any stocks, bonds, securities, cash or other property
at any time held by the Trustees to be registered in the name of a nominee or
nominees.

            11. To compromise, settle or arbitrate any claim in favor of or
against the trust hereunder.

            12. To determine whether, and, if so, to what extent, premiums on
investments shall be amortized.

            13. To make any distribution hereunder, in whole or in part, in
securities or other property comprising the principal of the trust at the time
of such distribution, and in making such distribution the Trustees shall not be
required to prorate any item of property so distributed among the persons
entitled to such distribution, but shall be authorized and empowered to
distribute different items of property to the distributees.

            14. To maintain on behalf of the trust hereunder one or more custody
accounts with any bank, trust company or brokerage firm wherever located, and to
retain investment counsel, investment advisers, accountants and attorneys
(including any firm of investment counsel, investment advisers, accountants or
attorneys with which the Trustees from time to time acting hereunder shall be
associated or otherwise connected) and to charge the cost thereof to the
principal or income of such trust as the Trustees may deem appropriate.


                                       13
<PAGE>

            15. To delegate any or all of the powers and authorities
hereinbefore conferred upon Trustees in Subparagraphs 1, 2 and 4 hereof, at any
time and from time to time, with respect to all or any portion of the property
held hereunder, to any one or more individual or institutional investment
advisers or investment managers for any period or periods and upon such terms,
conditions and for such compensation as the Trustees shall in their sole and
unreviewable discretion deem appropriate, it being expressly provided that the
Trustees shall have no responsibility or liability for any loss to the trust
hereunder by reason of any action taken or omitted to be taken as a result of
such delegation.

            16. To allocate and credit to income so much or all of any
distribution made by a regulated investment company or mutual fund that is
designated a "dividend" by such company or mutual fund, even though paid from
short-term capital gain or any source other than ordinary income.

            17. To determine whether any dividend, other than an ordinary cash
dividend, declared and paid upon any securities held by the Trustees, whether
payable in cash, in stock (issued by the corporation declaring the same or by
any other corporation), in bonds, or otherwise, shall be treated as and
allocable to principal or income, or partly to principal and partly to income,
and the Trustees shall not be required to treat any particular dividend in the
same manner as previous dividends upon the same or other securities, or to make
any determination on the basis of whether any particular dividend represents in
whole or in part a distribution of earnings or surplus regardless of when earned
or created. This provision shall be in lieu of any statute or applicable rule of
law now or hereafter in effect in the State of Florida.


                                       14
<PAGE>

            18. To exercise any other or further authority or discretion not
hereinabove specifically granted as may from time to time be permitted by
applicable statutes or rules of law, it being the Grantor's intention that the
foregoing powers shall be in addition to and shall not be deemed a limitation
upon such authority and discretion as the Trustees would have but for such
provisions.

      B. Persons dealing with the Trustees shall not be bound to see to the
application of any moneys paid to the Trustees pursuant to their exercise of any
of the foregoing powers.

                                     EIGHTH

      Whenever necessary or appropriate, the use herein of any gender shall be
deemed to include the other gender and the use herein of either the singular or
the plural shall be deemed to include the other.

                                      NINTH

      The trust hereby created shall be irrevocable, and neither the Grantor
nor, except as expressly provided in Subparagraph 1 of Paragraph F of Article
FIRST, any Trustee at any time acting hereunder shall have the right to change,
alter or amend any of the provisions thereof.

                                      TENTH

      The trust created hereunder shall be deemed to be a Florida trust and
shall be governed and construed in all respects by and in accordance with the
laws of the State of Florida. The Trustees, however, is prohibited from
exercising any power or discretion granted under said laws that would be
inconsistent with the qualification of the annuity amount payable under Article
FIRST hereof as a "guaranteed annuity interest" under Section 2522(c)(2)(B) of
the Code and the corresponding regulations.


                                       15
<PAGE>

      IN WITNESS WHEREOF, the Grantor signs, seals, publishes, and declares this
instrument to be an Irrevocable Trust Agreement and, for purpose of
identification, the Grantor has signed his initials on each page other than the
signature page, and the Grantor has signed his name, in the presence of the
persons witnessing this Trust Agreement, at the Grantor's request, on the day
and year first above written.

/s/ Jeffrey R. McCurdy              /s/ Barry Silverstein
- -----------------------------       -----------------------------
Witness                             BARRY SILVERSTEIN


/s/ Randy Arnaud
- -----------------------------
Witness


ACCEPTANCE BY TRUSTEES

                                    /s/ Mark Shale Silverstein
                                    -----------------------------
                                    MARK SHALE SILVERSTEIN


                                    /s/ Dennis McGillicuddy
                                    -----------------------------
                                    DENNIS McGILLICUDDY


                                       16
<PAGE>

STATE OF FLORIDA     )
                     ) SS:
COUNY OF             )

      We, BARRY SILVERSTEIN, Jeffrey R. McCurdy and Randy Arnaud, the Grantor
and the witnesses respectively, whose names are signed to the foregoing
instrument, having been sworn, declared to the undersigned officer that the
Grantor in the presence of witnesses signed the instrument as an Irrevocable
Trust Agreement, that the Grantor signed and that each of the witnesses, in the
presence of the Grantor and in the presence of each other signed the Agreement
as a witness.

                                          /s/ Barry Silverstein
                                          ----------------------
                                          BARRY SILVERSTEIN

                                          /s/ Jeffrey R. McCurdy
                                          ----------------------
                                          Witness

                                          /s/ Randy Arnaud
                                          ----------------------
                                          Witness

      Subscribed and sworn to before me by BARRY SILVERSTEIN, the Grantor, who
is personally known to me or who has produced _____________ as identification,
and by Jeffrey R. McCurdy, a witness, who is personally known to me or who has
produced ______________________ as identification, and byRandy Arnaud, a
witness, who is personally known to me or who has produced
_______________________ as identification, on this 17th day of September, 2003.

                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Notary Public

[NOTARY SEAL]


                                       17
<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF                   )

      The foregoing instrument was acknowledged before me this 17th day of
September, 2003, by BARRY SILVERSTEIN , who is personally known to me or who has
produced __________________________ as identification.


                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Name: Linnette A. Fauroat
[NOTARY SEAL]


STATE OF ENGLAND            )
                            ) ss.:
CITY OF LONDON              )

      The foregoing instrument was acknowledged before me this 2nd day of
October, 2003, by MARK SHALE SILVERSTEIN, who is personally known to me or who
has produced US Passport 700913975 as identification.


                                    /s/ Barrington William Hooke
                                    -----------------------
                                    Name: BARRINGTON WILLIAM HOOKE
                                          NOTARY PUBLIC, LONDON

                                        [NOTARY SEAL]

<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 22 day of
September, 2003, by DENNIS McGILLICUDDY, who is personally known to me or who
has produced __________________________ as identification.


                                    /s/ Christen Flenard
                                    -----------------------
                                    Name: Christen Flenard
[NOTARY SEAL]


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-8
<SEQUENCE>8
<FILENAME>ex-8.txt
<TEXT>

                                                                       Exhibit 8


      INDENTURE OF TRUST made as of the 17th day of September, 2003, by and
between BARRY SILVERSTEIN, as Grantor, and MARK SHALE SILVERSTEIN and DENNIS
McGILLICUDDY, as Trustees.

                              W I T N E S S E T H :

      The Grantor hereby transfers, assigns and delivers to the Trustees the
property described in Schedule A annexed hereto (and the Trustees hereby
acknowledges receipt of such property), to hold the same, IN TRUST, to invest
and reinvest, to collect the rents, income and profits thereof, and to dispose
of the same upon the terms hereinafter set forth.

      The trust created herein shall be known as the "THOMAS BENJAMIN
SILVERSTEIN 2003 CLAT."

                                      FIRST

      A. In each year of the "trust term" (as hereinafter defined), the Trustees
shall make payments aggregating the "annuity amount" (as hereinafter defined) to
The William James Foundation, Inc. (or, if The William James Foundation, Inc.
shall not be a "charitable organization" (as defined in Paragraph G below) at
the time of any payment hereunder, to such one or more charitable organizations
in such amounts or proportions, as the Trustees shall, in their sole and
unreviewable discretion, select and determine).

      B. The "trust term" shall mean the twenty (20) year period commencing on
the date hereof.

      C. The term "annuity amount" shall be such amount which shall be required
to generate a Federal gift tax charitable deduction equal to the value of the
initial net fair market value of the principal of such trust as finally
determined for Federal gift tax purposes, for the annuity which is to be paid
pursuant to the terms of Paragraph A above, as calculated using (a) the lowest

<PAGE>

Applicable Federal Rate promulgated by the Treasury Department for valuing
annuities which the Trustees may elect to use under Section 7520(a) of the
Internal Revenue Code of 1986, as amended (hereinafter referred to as the
"Code"), and (b) the procedures promulgated by the Treasury Department for
valuing annuities.. In determining such initial net fair market value, the
assets of such trust shall be valued at the values finally determined therefor
for Federal estate tax purposes.

            If the initial net fair market value of the property contributed to
the trust created hereunder is incorrectly determined, then, within a reasonable
period after such net fair market value is finally determined, the Trustees
shall (in the case of an undervaluation) pay to or shall (in the case of an
overvaluation) receive from The William James Foundation, Inc. and/or the
charitable organization or charitable organizations, as the case may be, as
shall have received an incorrectly determined annuity amount, and if more than
one, in the proportions in which they shall have shared in such incorrectly
determined annuity amount, an amount equal to the difference between:

                        (a) any annuity amounts actually paid, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period;
            and

                        (b) the annuity amounts payable, plus interest,
            compounded annually, computed for any period at the rate of interest
            that the Federal income tax regulations under Section 664 of the
            Code prescribe for the trust for such computation for such period.


                                        2
<PAGE>

      D. In case of any taxable year of the trust during the trust term which is
for a period of less than twelve months, the annuity amount for such year shall
be prorated on a daily basis.

      E. The Trustees shall make payments under Paragraph A above aggregating
the annuity amount annually. Any payment made during any taxable year of the
trust, or treated (at the election of the Trustees pursuant to Section 642(c)(1)
of the Code) for Federal income tax purposes as having been made during such
year, in satisfaction of the annuity amount, shall first be made from the
ordinary income (including short term capital gain) other than unrelated
business income of the trust for such year, thereafter from capital gains of the
trust for the year, thereafter from unrelated business income of such trust for
the year, thereafter from tax-exempt income and, if and to the extent that such
ordinary income, capital gains and unrelated business income and tax-exempt
income shall be insufficient to pay the annuity amount, then from the principal
of the trust. Any net income not required for the payment of the annuity amount
shall be added to principal.

      F. 1. It is the Grantor's intention that the twenty (20) year annuity
payable under this Indenture shall qualify as a deductible charitable interest
under Section 2522(c)(2)(B) of the Code and regulations thereunder and that the
Grantor shall be entitled to a charitable deduction for Federal gift tax
purposes for the full value, as of the date hereof, of such annuity. The Grantor
therefore directs that all provisions of this Indenture shall be interpreted and
construed so as to give effect to such intention and that the Trustees shall pay
all payments on account of the annuity amount at such times and in such amounts
and shall also otherwise administer the trust in such manner as may be required
to qualify such annuity for the aforesaid charitable deduction. If such Section
or regulations, or any successor Section or regulations, or any ruling, notice


                                       3
<PAGE>

or other administrative pronouncement issued thereunder, at any time requires
that an instrument creating a "guaranteed annuity interest" within the meaning
of Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder
must contain provisions that are not expressly set forth herein, such provisions
shall be incorporated into this Indenture of Trust by reference and shall be
deemed to be a part of this Indenture of Trust to the same extent as though they
had been expressly set forth herein. The Trustees shall have the power, acting
by majority, to amend the Trust created hereunder in any manner required for the
sole purpose of ensuring that the annuity amount payable under Article FIRST
hereof qualifies as a "guaranteed annuity interest" within the meaning of
Section 2522(c)(2)(B) of the Code and the regulations promulgated thereunder.

            2. If the effect of any provision of this Indenture would be to
prevent the allowance of said charitable deduction for such annuity, then the
Grantor directs that such offending provision shall not apply to the trust.

            3. Anything to the contrary in this trust notwithstanding, during
such time as the trust created hereunder shall be a trust described in Section
4947(a)(2) of the Code, the Trustees shall be prohibited from:

                        (i) engaging in any act of "self-dealing," as defined in
            Section 4941(d) of the Code;

                        (ii) retaining any "excess business holdings," as
            defined in Section 4943(c) of the Code;

                        (iii) making any investments so as to subject the trust
            to tax under Section 4944 of the Code, or retaining any investments
            which would subject the trust to such tax if the Trustees had
            acquired such investments; and

                        (iv) making any "taxable expenditures," as defined in
            Section 4945(d) of the Code.


                                       4
<PAGE>

            4. References to Sections of the Code in this Indenture shall also
be deemed to refer to corresponding provisions of any subsequent Federal tax
law.

            5. No additional contribution shall be made to the trust created
hereunder.

            6. Nothing contained in this Indenture shall be construed to
restrict the

Trustees from investing the assets of the trust in a manner which could result
in the annual realization of a reasonable amount of income or gain from the sale
or disposition of trust assets.

      G. The term "charitable organization" as used in this Indenture shall mean
an organization organized and operated exclusively for religious, charitable,
scientific, literary or educational purposes or for the prevention of cruelty to
children or animals as described in Sections 170(c), 501(c)(3) and 2522(a) of
the Code (or any corresponding provisions of the tax laws from time to time in
effect), gifts to which are deductible for Federal income and gift tax purposes.

                                     SECOND

            Upon the termination of the Term, the trust estate then remaining
(after making any payments required by Paragraph A of Article FIRST) shall be
paid over and distributed to such person or persons (including THOMAS BENJAMIN
SILVERSTEIN, the estate of THOMAS BENJAMIN SILVERSTEIN, his creditors and the
creditors of his estate) in such amounts or proportions and upon such estates
(whether in trust or otherwise) as THOMAS BENJAMIN SILVERSTEIN shall appoint by
instrument in writing, duly signed and acknowledged by him and delivered to a
then acting Trustee (other than himself) during his lifetime, or in his Last
Will and Testament, by specific reference to this Indenture of Trust. The
Grantor directs that any portion or all of the trust estate that is not
effectively appointed shall be paid over and distributed to THOMAS BENJAMIN


                                       5
<PAGE>

SILVERSTEIN, absolutely, or if he is not then living, to his then living issue,
per stirpes, absolutely, and in default of such issue, to the then living issue
of the Grantor from his marriage to Lois Silverstein, per stirpes, or if none,
to the then living issue of the Grantor, per stirpes, absolutely.

                                        III.third

      A. 1. If DENNIS McGILLICUDDY shall cease to act as a trustee hereof, the
following are appointed as successor Trustees, to take office, singly, in the
order named: STEPHEN BLECHNER and JAMES B. SHEIN.

            2. Upon attaining the age of 40 years, THOMAS BENJAMIN SILVERSTEIN
shall be allowed to qualify as a co-Trustee to act contemporaneously with the
then acting Trustees of the trust created hereunder, PROVIDED, HOWEVER, that if
THOMAS BENJAMIN SILVERSTEIN shall so qualify, MARK SHALE SILVERSTEIN shall
immediately cease to act as a Trustee hereof.

            3. The last to act of the Trustees (including substitutes and/or
successors) herein named in respect of the trust hereunder and each of the
successors appointed as herein provided, is authorized and empowered to appoint
a successor Trustee, to take office upon such appointing Trustee ceasing to act
hereunder.

            4. The Grantor directs that any two of THOMAS BENJAMIN SILVERSTEIN,
MARK SHALE SILVERSTEIN, and, SUSAN SILVERSTEIN POTTER, or if only one of them
shall then be living and competent, such one, acting alone, are authorized and
empowered, at any time and from time to time, (i) to appoint a successor Trustee
or a series of successor Trustees to fill any vacancy that may then exist or
thereafter arise in the office of Trustee hereunder, (ii) to increase the number
of Trustees acting as Trustees of the trust created herein by appointing one or
more additional co-Trustees, and (iii) to remove any Trustee, successor Trustee


                                       6
<PAGE>

or co-Trustee, other than THOMAS BENJAMIN SILVERSTEIN, MARK SHALE SILVERSTEIN or
DENNIS McGILLICUDDY, at any time acting hereunder, PROVIDED, HOWEVER, that if
THOMAS BENJAMIN SILVERSTEIN shall be acting as a Trustee of the trust created
herein, he shall not vote for the appointment of a person who is a "related or
subordinate party" within the meaning of Section 672(c) of the Code or any
successor provisions thereto with respect to himself.

      B. Any appointment of a successor Trustee or successor Trustees pursuant
to Paragraph A hereof shall be made by instrument in writing, duly signed and
acknowledged, and may from time to time prior to the qualification of the person
or persons therein designated, be revoked or amended by the person making such
appointment, similarly executed and acknowledged.

      C. In no event shall the Grantor, or any other person who has made a
contribution to the trust created hereunder, be appointed as a successor Trustee
hereunder.

      D. The term "Trustees" wherever used herein, shall be taken to mean the
Trustees for the time being in office; and except as otherwise provided in this
Article THIRD, each such Trustee shall have the same rights, powers, duties,
authority and privileges, whether or not discretionary, as if originally
appointed hereunder.

      E. No Trustee acting hereunder, whether named herein or appointed pursuant
hereto, shall be required to post any bond or other security for the faithful
performance of his or her duties hereunder.

                                     FOURTH

      A. The Trustees named herein hereby assume the trust created by this
Indenture of Trust and undertake to carry out each and every provision hereof.


                                       7
<PAGE>

      B. Any successor Trustee hereunder shall qualify by executing an
instrument in writing, duly signed and acknowledged, expressly agreeing to
assume the trust created by this Indenture of Trust and to carry out each and
every provision thereof.

      C. No Trustee acting hereunder shall incur any liability for any act done
or omitted in the exercise of his or her duties as Trustee in good faith.

                                      FIFTH

      A. Any Trustee acting hereunder, at any time, may resign his or her office
as Trustee by written declaration duly signed by him or her and delivered to the
successor Trustee designated to succeed such Trustee and to his or her
co-Trustees, if any. Such resignation shall become effective upon the date
specified therein.

      B. Any Trustee at any time acting hereunder, any resigned Trustee, and the
executor or administrator of the estate of any deceased Trustee, at any time and
from time to time, may render an account of the acts and transactions of such
Trustee with respect to the income and principal of the trust created hereunder
(from the date of the creation of such trust or from the date of the last
previous account of the Trustee, as the case may be) to The William James
Foundation, Inc. and to Thomas Benjamin Silverstein, or if Thomas Benjamin
Silverstein shall not then be living, to the then living issue of Thomas
Benjamin Silverstein, or if none, to the Grantor's then living children of his
marriage to Lois Silverstein, or if none, to the Grantor's then living
descendants of his marriage to Lois Silverstein, or if none, to the Grantor's
then living issue; PROVIDED, HOWEVER, that if any such person to whom an account
may be rendered shall be a minor, any such account may instead be rendered to
such person's parent or legal guardian other than the Grantor or any Trustee
hereunder. The persons hereinabove described shall have full power and
authority, on behalf of all persons who may at any time be interested in such


                                       8
<PAGE>

trust, finally to settle and adjust such account; and upon such account being
settled and adjusted, it shall be final and conclusive upon each and every
person (whether then living or then ascertainable or not) who shall then or
thereafter be or become interested in either the income or the principal of such
trust, with like effect as a judgment of a court having jurisdiction, judicially
settling such account in an action in which the Trustee and all persons having
or claiming to have an interest in the trust were parties.

            Nothing contained in the foregoing paragraph shall be deemed to
preclude a Trustee from having his account judicially settled if such Trustee
shall deem this advisable.

      C. In any proceeding in which all persons interested in the trust
hereunder are required to be served with process, and in which a party to the
proceeding has the same interest as a person under a disability, it shall not be
necessary to serve the person under a disability, it being the Grantor's
intention hereof to avoid the appointment of a guardian ad litem, whenever
possible.

                                      SIXTH

      The Trustees are authorized, in their discretion and notwithstanding the
foregoing provisions of this Indenture of Trust:

      A. In any case in which they are authorized or required to pay or
distribute income or principal to any person who is a minor, to apply the whole
or part of such income or principal, in their absolute discretion, to the
minor's use in any one or more of the following ways:

            1. By depositing the same in a savings account in the minor's name
with any bank or trust company;


                                       9
<PAGE>

            2. By distributing the same to any person (other than a person who
has made a contribution to the trust), including a person acting as Trustee
hereunder, (i) as Custodian for such minor under any Uniform Gifts to Minors Act
or Uniform Transfers to Minors Act authorizing such payment; (ii) with whom the
minor shall at the time reside; or (iii) then having the care or control of such
minor;

            3. By paying the same to such minor or to any other person (other
than a person who has made a contribution to the trust), firm or corporation
(other than a firm or corporation controlled by a person who has made a
contribution to the trust) for the account and benefit of such minor.

            The Trustees, in any of the above cases, shall be under no
obligation to look to the proper application of any such payment or distribution
by the person receiving it. Any payment hereinabove authorized shall be a full
discharge to the Trustees with respect thereto.

            If the Trustees make a distribution to a custodian under
Subparagraph 2 above, they are authorized to make any election or designation
concerning the age at which the minor is to receive the property that may be
made under any applicable Uniform Gifts to Minors Act or Uniform Transfers to
Minors Act.

      B. To defer, in whole or in part, payment or distribution of any property
vesting absolutely in a minor hereunder, until such minor shall have attained
majority; to expend the same or any part thereof, and the income therefrom, for
the benefit of such minor in any manner hereinabove authorized in Paragraph A
hereof, holding the whole or the undistributed portion thereof, and the income
thereon, as a separate and distinct share for such minor, absolutely; and to
transfer, pay over and deliver any remaining principal and income held hereunder
to the minor when he or she attains majority, or to the estate of such minor if
he or she dies prior to attaining majority.


                                       10
<PAGE>

      C. For purposes of this Indenture of Trust, a "minor" shall be deemed to
be a person under the age of twenty-one years and "majority" shall be deemed to
be the age of twenty-one years.

                                     SEVENTH

      A. Subject to Paragraph F of Article FIRST hereof, the Trustees shall
have, with respect to any and all property at any time held by them hereunder
(including property held for the benefit of minors under Article SIXTH hereof)
the following powers, in addition to those conferred by law:

            1. To retain any such property as an investment without regard to
the proportion which such property, or property of a similar character, may bear
to the entire amount of the trust estate, whether or not such property is of the
class in which trustees are authorized by law or any rule of court to invest
trust funds.

            2. To sell any such property at either public or private sale, for
cash or on credit, and to exchange such property.

            3. To grant options for the purchase of any such property, upon any
terms and conditions, for any period or periods of time, even if the period
during which any such option shall be exercisable shall extend beyond the
probable duration of the trust hereunder.

            4. To invest and reinvest in property of any character, real or
personal, foreign or domestic, including, but without limiting the generality of
the foregoing, to acquire both short and long positions, in cash or on margin,
in bonds, notes, debentures, mortgages, common and preferred stock (irrespective
of whether there shall be a public market therefor), shares or interests in
investment trusts, general and limited partnership interests, and interests in


                                       11
<PAGE>

limited liability companies without being limited to the class of securities in
which trustees are authorized by law or any rule of court to invest trust funds
and without regard to the proportion which any such property or property of a
similar character held by the Trustees may bear to the entire amount of the
Trust estate or the speculative or unproductive nature of any such investment or
investments, and the Trustees shall be fully protected in respect of any such
investment made by them in good faith.

            5. To borrow money and give indemnities and guaranties for any
purpose in connection with the administration of the trust created hereunder, to
continue or renew any loan made to the Trustees and in connection therewith to
mortgage, pledge or otherwise encumber any property forming part of the trust
upon any terms and conditions, in any amounts, and for any period of time, even
if for longer than the probable duration of the trust.

            6. To lend any part of the trust, with or without security, in any
amount, upon any terms and conditions, at any reasonable rate of interest, for
any period or periods of time even if longer than the probable duration of the
trust, and to any person, firm or corporation other than the Grantor or the
Grantor's spouse or a firm or corporation owned or controlled by the Grantor
and/or the Grantor's spouse.

            7. To manage any real property held by the Trustees hereunder in the
same manner as if the Trustees were the absolute owners thereof, including,
without limitation, to lease, or grant options to lease, any such real property
for any term or terms, although in excess of any period permitted by statute or
other rule of law (and although any such term may extend beyond the period of
administration of any trust hereunder), without application to any court.


                                       12
<PAGE>

            8. To vote on any securities forming part of any trust by
discretionary proxy or otherwise; to join in or oppose any reorganization,
recapitalization, sale, lease, merger, exchange or consolidation; to exercise
conversion, subscription or other rights, or to sell or abandon such rights; to
receive and hold any securities issued as a result of any of the foregoing
transactions; and generally to take all action in respect of any such securities
as the Trustees might or could do as the absolute owners thereof.

            9. To deposit any securities with voting trustees or protective or
similar committees, to delegate to them discretionary powers, to pay a share of
their expense and compensation, and to charge the same to principal or income as
the Trustees may see fit.

            10. To cause any stocks, bonds, securities, cash or other property
at any time held by the Trustees to be registered in the name of a nominee or
nominees.

            11. To compromise, settle or arbitrate any claim in favor of or
against the trust hereunder.

            12. To determine whether, and, if so, to what extent, premiums on
investments shall be amortized.

            13. To make any distribution hereunder, in whole or in part, in
securities or other property comprising the principal of the trust at the time
of such distribution, and in making such distribution the Trustees shall not be
required to prorate any item of property so distributed among the persons
entitled to such distribution, but shall be authorized and empowered to
distribute different items of property to the distributees.


                                       13
<PAGE>

            14. To maintain on behalf of the trust hereunder one or more custody
accounts with any bank, trust company or brokerage firm wherever located, and to
retain investment counsel, investment advisers, accountants and attorneys
(including any firm of investment counsel, investment advisers, accountants or
attorneys with which the Trustees from time to time acting hereunder shall be
associated or otherwise connected) and to charge the cost thereof to the
principal or income of such trust as the Trustees may deem appropriate.

            15. To delegate any or all of the powers and authorities
hereinbefore conferred upon Trustees in Subparagraphs 1, 2 and 4 hereof, at any
time and from time to time, with respect to all or any portion of the property
held hereunder, to any one or more individual or institutional investment
advisers or investment managers for any period or periods and upon such terms,
conditions and for such compensation as the Trustees shall in their sole and
unreviewable discretion deem appropriate, it being expressly provided that the
Trustees shall have no responsibility or liability for any loss to the trust
hereunder by reason of any action taken or omitted to be taken as a result of
such delegation.

            16. To allocate and credit to income so much or all of any
distribution made by a regulated investment company or mutual fund that is
designated a "dividend" by such company or mutual fund, even though paid from
short-term capital gain or any source other than ordinary income.

            17. To determine whether any dividend, other than an ordinary cash
dividend, declared and paid upon any securities held by the Trustees, whether
payable in cash, in stock (issued by the corporation declaring the same or by
any other corporation), in bonds, or otherwise, shall be treated as and
allocable to principal or income, or partly to principal and partly to income,
and the Trustees shall not be required to treat any particular dividend in the
same manner as previous dividends upon the same or other securities, or to make
any determination on the basis of whether any particular dividend represents in


                                       14
<PAGE>

whole or in part a distribution of earnings or surplus regardless of when earned
or created. This provision shall be in lieu of any statute or applicable rule of
law now or hereafter in effect in the State of Florida.

            18. To exercise any other or further authority or discretion not
hereinabove specifically granted as may from time to time be permitted by
applicable statutes or rules of law, it being the Grantor's intention that the
foregoing powers shall be in addition to and shall not be deemed a limitation
upon such authority and discretion as the Trustees would have but for such
provisions.

      B. Persons dealing with the Trustees shall not be bound to see to the
application of any moneys paid to the Trustees pursuant to their exercise of any
of the foregoing powers.

                                     EIGHTH

      Whenever necessary or appropriate, the use herein of any gender shall be
deemed to include the other gender and the use herein of either the singular or
the plural shall be deemed to include the other.

                                      NINTH

      The trust hereby created shall be irrevocable, and neither the Grantor
nor, except as expressly provided in Subparagraph 1 of Paragraph F of Article
FIRST, any Trustee at any time acting hereunder shall have the right to change,
alter or amend any of the provisions thereof.

                                      TENTH

      The trust created hereunder shall be deemed to be a Florida trust and
shall be governed and construed in all respects by and in accordance with the
laws of the State of Florida. The Trustees, however, is prohibited from
exercising any power or discretion granted under said laws that would be
inconsistent with the qualification of the annuity amount payable under Article
FIRST hereof as a "guaranteed annuity interest" under Section 2522(c)(2)(B) of
the Code and the corresponding regulations.


                                       15
<PAGE>

      IN WITNESS WHEREOF, the Grantor signs, seals, publishes, and declares this
instrument to be an Irrevocable Trust Agreement and, for purpose of
identification, the Grantor has signed his initials on each page other than the
signature page, and the Grantor has signed his name, in the presence of the
persons witnessing this Trust Agreement, at the Grantor's request, on the day
and year first above written.


/s/ Jeffrey R. McCurdy              /s/ Barry Silverstein
- -----------------------------       -----------------------------
Witness                             BARRY SILVERSTEIN


/s/ Randy Arnaud
- -----------------------------
Witness


ACCEPTANCE BY TRUSTEES

                                    /s/ Mark Shale Silverstein
                                    -----------------------------
                                    MARK SHALE SILVERSTEIN


                                    /s/ Dennis McGillicuddy
                                    -----------------------------
                                    DENNIS McGILLICUDDY


                                       16
<PAGE>

STATE OF FLORIDA     )
                     ) SS:
COUNY OF SARASOTA    )

      We, BARRY SILVERSTEIN, Jeffrey R. McCurdy and Randy Arnaud, the Grantor
and the witnesses respectively, whose names are signed to the foregoing
instrument, having been sworn, declared to the undersigned officer that the
Grantor in the presence of witnesses signed the instrument as an Irrevocable
Trust Agreement, that the Grantor signed and that each of the witnesses, in the
presence of the Grantor and in the presence of each other signed the Agreement
as a witness.

                                          /s/ Barry Silverstein
                                          ----------------------
                                          BARRY SILVERSTEIN

                                          /s/ Jeffrey R. McCurdy
                                          ----------------------
                                          Witness

                                          /s/ Randy Arnaud
                                          ----------------------
                                          Witness

      Subscribed and sworn to before me by BARRY SILVERSTEIN, the Grantor, who
is personally known to me or who has produced _____________ as identification,
and by Jeffrey R. McCurdy, a witness, who is personally known to me or who has
produced ______________________ as identification, and by Randy Arnaud, a
witness, who is personally known to me or who has produced
_______________________ as identification, on this 17th day of September, 2003.

                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Notary Public

[NOTARY SEAL]


                                       17
<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 17th day of
September, 2003, by BARRY SILVERSTEIN , who is personally known to me or who has
produced __________________________ as identification.


                                    /s/ Linnette A. Fauroat
                                    -----------------------
                                    Name: Linnette A. Fauroat
[NOTARY SEAL]


STATE OF ENGLAND            )
                            ) ss.:
CITY OF LONDON              )

      The foregoing instrument was acknowledged before me this 2nd day of
October, 2003, by MARK SHALE SILVERSTEIN, who is personally known to me or who
has produced US Passport 700913975 as identification.


                                    /s/ Barrington William Hooke
                                    -----------------------
                                    Name: BARRINGTON WILLIAM HOOKE
                                          NOTARY PUBLIC, LONDON

                                        [NOTARY SEAL]

<PAGE>

STATE OF FLORIDA            )
                            ) ss.:
COUNTY OF SARASOTA          )

      The foregoing instrument was acknowledged before me this 22 day of
September, 2003, by DENNIS McGILLICUDDY, who is personally known to me or who
has produced __________________________ as identification.


                                    /s/ Christen Flenard
                                    -----------------------
                                    Name: Christen Flenard
[NOTARY SEAL]


</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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