
<PAGE>

                                                                 Exhibit 10.8

                          AGREEMENT OF PURCHASE AND SALE

                                     BETWEEN

                         LINDEN PARK LIMITED PARTNERSHIP
                                    AS SELLER

                                       AND

                      BRANDYWINE OPERATING PARTNERSHIP, L.P.
                                     AS BUYER

                                December 15, 1997






<PAGE>
                                TABLE OF CONTENTS
                                                                            Page

                                    ARTICLE I

                                   DEFINITIONS

Section 1.1  Definitions.......................................................1
Section 1.2  Terms Generally...................................................6

                                   ARTICLE II

                         PURCHASE AND SALE OF PROPERTY


Section 2.1  Sale..............................................................6
Section 2.2  Purchase Price....................................................7
Section 2.3  Due Diligence.....................................................9

                                  ARTICLE III

                             CONDITIONS PRECEDENT

Section 3.1  Conditions to Buyer's Obligation to Purchase......................9
Section 3.2  Conditions to Seller's Obligations to Sell.......................11
Section 3.3  Termination......................................................11
Section 3.4  Waiver by Buyer..................................................12
Section 3.5  [Intentionally Omitted]..........................................12

                                  ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES;
                     BUYER'S EXAMINATION OF THE  PROPERTY

Section 4.1  Representations and Warranties of Seller.........................12
Section 4.2  Estoppels........................................................14
Section 4.3  Limitation on Claims; Survival of Representations and Warranties.14


                                      -i-
<PAGE>

Section 4.4  Representations and Warranties of Buyer..........................16
Section 4.5  Buyer's Independent Investigation................................17
Section 4.6  Entry and Indemnity; Limits on Government Contacts...............20
Section 4.7  Release..........................................................21

                                  ARTICLE V
                                    TITLE

Section 5.1  Conveyance of Title..............................................22
Section 5.2  Evidence of Title................................................23

                                 ARTICLE VI

                            BROKERS AND EXPENSES

Section 6.1  Brokers..........................................................24
Section 6.2  Expenses.........................................................24

                                ARTICLE VII

                    INTERIM OPERATION OF THE  PROPERTY

Section 7.1  Interim Operation of the  Property...............................24
Section 7.2  Tenant Improvement Costs, Leasing Commissions and Free Rent......26
Section 7.3  Seller's Maintenance of the  Property............................26
Section 7.4  Lease Enforcement................................................26
Section 7.5  Lease Termination Prior to Closing...............................27
Section 7.6  Tenant Notices...................................................27
Section 7.7  Risk of Loss and Insurance Proceeds..............................27
Section 7.8  Notifications....................................................28

                                 ARTICLE VIII

                              CLOSING AND ESCROW

Section 8.1  Escrow Instructions..............................................28


                                      -ii-
<PAGE>

Section 8.2  Closing..........................................................28
Section 8.3  Deposit of Documents.............................................29
Section 8.4  Estoppel Certificates............................................31
Section 8.5  Prorations.......................................................32
Section 8.6  Tax Certiorari Proceedings.......................................34
Section 8.7  Tenant Obligations...............................................35

                                  ARTICLE IX

                                 MISCELLANEOUS

Section 9.1  Notices..........................................................36
Section 9.2  Entire Agreement.................................................37
Section 9.3  Time.............................................................37
Section 9.4  Attorneys' Fees..................................................37
Section 9.5  No Merger........................................................37
Section 9.6  Assignment.......................................................37
Section 9.7  Counterparts.....................................................37
Section 9.8  Governing Law; Jurisdiction and Venue............................38
Section 9.9  Waiver of Trial by Jury..........................................38
Section 9.10  Confidentiality and Return of Documents.........................39
Section 9.11  Interpretation of Agreement.....................................41
Section 9.12  Amendments......................................................41
Section 9.13  No Recording....................................................41
Section 9.14  No Third Party Beneficiary......................................41
Section 9.15  Severability....................................................41
Section 9.16  Drafts not an Offer to Enter into a Legally Binding Contract....41
Section 9.17  Further Assurances..............................................42
Section 9.18  [Intentionally Omitted].........................................42
Section 9.19  Exculpation.....................................................42
Section 9.20  Counterparts....................................................42


                                     -iii-
<PAGE>

EXHIBITS

EXHIBIT A     Real Property DEED
EXHIBIT B     [INTENTIONALLY OMITTED ]
EXHIBIT C     INTENTIONALLY OMITTED
EXHIBIT D     INTENTIONALLY OMITTED
EXHIBIT E     BILL OF SALE
EXHIBIT F     ASSIGNMENT OF LEASES
EXHIBIT G     ASSIGNMENT OF CONTRACTS, WARRANTIES AND
              GUARANTEES AND OTHER INTANGIBLE PROPERTY
EXHIBIT H     DESIGNATION AGREEMENT
EXHIBIT I     BUYER'S AS-IS CERTIFICATE
EXHIBIT J     TENANT ESTOPPEL CERTIFICATE
EXHIBIT K     INTENTIONALLY OMITTED
EXHIBIT L     SELLER'S AFFIDAVIT
EXHIBIT M     [INTENTIONALLY OMITTED]
EXHIBIT N     ESCROW AGREEMENT

SCHEDULES

SCHEDULE 1         SELLER
SCHEDULE 2.1.1     PROPERTY DESCRIPTION
SCHEDULE 2.1.3     EXISTING LEASES
SCHEDULE 2.1.5     PURCHASE RIGHTS
SCHEDULE 2.2.2     WIRING INSTRUCTIONS
SCHEDULE 4.1.1     REQUIRED CONSENTS
SCHEDULE 4.1.2     NON-TERMINABLE CONTRACTS
SCHEDULE 4.1.3     PENDING LITIGATION
SCHEDULE 4.1.4     MUNICIPAL VIOLATION NOTICES
SCHEDULE 7.2       LEASING COSTS



                                      -iv-
<PAGE>



                         AGREEMENT OF PURCHASE AND SALE


         AGREEMENT OF PURCHASE AND SALE, dated as of December 15, 1997 (this 
"Agreement"), between Linden Park Limited Partnership, a Delaware limited 
partnership ("Seller"), and Brandywine Operating Partnership, L.P., a 
Delaware limited partnership ("Buyer").

                                    ARTICLE I

                                   DEFINITIONS
                                           
         Section 1.1  Definitions.  As used in this Agreement, the following 
terms shall have the meanings set forth below, which meanings shall be 
applicable equally to the singular and plural of the terms defined:

         "Additional Rents" shall have the meaning set forth in Section 8.5(a).

         "Affiliate" shall mean with respect to any Person (i) any other Person
    that directly or indirectly through one or more intermediaries controls or
    is controlled by or is under common control with such Person, (ii) any
    other Person owning or controlling 10% or more of the outstanding voting
    securities of or other ownership interests in such Person, (iii) any
    officer, director or partner of such Person, or (iv) if such Person is an
    officer, director or partner, any other company for which such Person acts
    in any such capacity.

         "Agreement" shall have the meaning set forth in the first paragraph of
    this Agreement.

         "Assignment of Contracts" shall have the meaning set forth in Section
    8.3(a).

         "Assignment of Leases" shall have the meaning set forth in Section
    8.3(a).

         "Bill of Sale" shall have meaning set forth in Section 8.3(a).

         "Business Day" shall mean any day other than a Saturday, a Sunday, or
    a federal holiday recognized by the Federal Reserve Bank of New York.

         "Buyer" shall have the meaning set forth in the first paragraph of
    this Agreement and shall include any assignee of Buyer (including, without
    limitation, any Permitted Assignee).

<PAGE>


         "Buyer Party" or "Buyer Parties" shall have the meaning set forth in
    Section 4.6.

         "Claim Notice" shall mean a written notice delivered by Buyer or a
    Permitted Assignee to Seller setting forth (i) the identity of the Property
    with respect to which a breach or inaccuracy of a representation or
    warranty is alleged to have occurred, (ii) a reasonably detailed
    description of the claimed breach or inaccuracy, including reasonably
    detailed information as to the adverse effect on the value of the Property
    to which such claimed breach relates, (iii) the specific provision of this
    Agreement under which such breach is claimed and (iv) complete and detailed
    evidence of the satisfaction of the conditions to Buyer's or a Permitted
    Assignee's recovery set forth in Section 4.3.

         "Claims" shall have the meaning set forth in Section 4.3(a).

         "Closing" shall have the meaning set forth in Section 2.2(b).

         "Closing Date" shall have the meaning set forth in Section 8.2.

         "Closing Documents" shall have the meaning set forth in
    Section 4.3(a).

         "Code" shall mean the Internal Revenue Code of 1986, as amended, or
    any corresponding provision(s) of any succeeding law.

         "Confidential Information" shall have the meaning set forth in Section
    9.10(c).

         "Confidentiality Agreement" shall mean the Confidentiality Agreement,
    dated October 8, 1997, between Brandywine Realty Trust and Seller. 

         "Contracts" shall have the meaning set forth in Section 2.1(e).

         "Deed" shall have the meaning set forth in Section 5.1(a).

         "Deposit" shall have the meaning set forth in Section 2.2(a).

         "Designation Agreement" shall have the meaning set forth in Section
    8.3(a).

         "Document Delivery Date" shall have the meaning set forth in Section
    8.3.

         "Due Diligence Materials" shall mean all of the documents and other
    materials delivered to, or made available for inspection by, Buyer, its
    Permitted Assignees and their representatives including, without
    limitation, the materials delivered to Buyer and its 

                                      -2-

<PAGE>

    representatives on or about November 21, 1997 and on-site materials made
    available to Buyer for inspection.

         "Effective Date" shall mean the date of this Agreement.

         "Evaluation Material" shall have the meaning set forth in
    Section 9.10(a).

         "Existing Leases" shall mean those leases, license agreements and
    occupancy agreements identified on Schedule 2.1.3, as the same may be
    amended or modified from time to time in accordance with the terms of this
    Agreement.

         "Fee Parcel" shall have the meaning set forth in Section 2.1(a). 

         "Governmental Authority" shall mean any federal, state, county or
    municipal government, or political subdivision thereof, any governmental
    agency, authority, board, bureau, commission, department, instrumentality,
    or public body, or any court or administrative tribunal.

         "Hazardous Materials" shall mean materials, wastes or substances that
    are (A) included within the definition of any one or more of the terms
    "hazardous substances," "hazardous materials," "toxic substances," "toxic
    pollutants" and "hazardous waste" in the Comprehensive Environmental
    Response, Compensation and Liability Act of 1980, as amended (42 U.S.C.
    Sections 9601, et seq.), the Resource Conservation and Recovery Act of 1976
    (42 U.S.C. Section 6901, et seq.), the Clean Water Act (33 U.S.C. Section
    1251, et seq.), the Safe Drinking Water Act (14 U.S.C. Section 1401, et
    seq.), the Hazardous Materials Transportation Act (49 U.S.C. Section 1801,
    et seq.), and the Toxic Substance Control Act (15 U.S.C. Section 2601, et
    seq.) and the regulations promulgated pursuant to such laws, (B) regulated,
    or classified as hazardous or toxic, under federal, state or local
    environmental laws or regulations, (C) petroleum, (D) asbestos or
    asbestos-containing materials, (E) polychlorinated biphenyls, (F) flammable
    explosives or (G) radioactive materials.

         "Improvements" shall have the meaning set forth in Section 2.1(a).

         "Indemnified Party" shall have the meaning set forth in Section 6.1.

         "Initial Deposit Date" shall mean the first Business Day after the
    Effective Date.

         "Intangible Property" shall have the meaning set forth in Section
    2.1(h).

         "Leases" shall mean all Existing Leases and New Leases, collectively.

                                      -3-

<PAGE>


         "Leasing Costs" shall have the meaning set forth in Section 7.2.

         "Licenses and Permits" shall have the meaning set forth in Section
    2.1(h).

         "New Leases" shall mean those leases, license agreements and occupancy
    agreements encumbering the Real Property which are entered into after the
    Effective Date in accordance with the terms of this Agreement, as the same
    may be amended or modified from time to time in accordance with the terms
    of this Agreement.

         "Non-Terminable Contracts" shall have the meaning set forth in Section
    4.1(h).

         "Order" shall mean an order or decree of any Governmental Authority.

         "Permitted Assignee" shall have the meaning set forth in Section 9.6.

         "Permitted Exceptions" shall have the meaning set forth in Section
    5.1.

         "Person" shall mean any individual, partnership, corporation, limited
    liability company, trust or other legal entity.

         "Personal Property" shall have the meaning set forth in Section
    2.1(c).

         "Prescribed Form" shall have the meaning set forth in Section 8.4.

         "Prime Rate" shall mean the prime (or base) rate of interest publicly
    announced by Citibank, N.A. or its successors from time to time.

         "Property shall have the meaning set forth in Section 2.1.

         "Purchase Price" shall have the meaning set forth in Section 2.2(a).

         "Real Estate Taxes" shall have the meaning set forth in Section
    4.5(b).

          "Real Property"shall have the meaning set forth in Section 2.1.

         "Records and Plans" shall have the meaning set forth in Section
    2.1(g).

         "Rent Rolls" shall have the meaning set forth in Section 4.1(g).

         "Representatives" shall have the meaning set forth in Section 9.10(a).

                                      -4-

<PAGE>


         "Required Deletion Items" shall have the meaning set forth in
    Section 3.1(c).

         "Required Percentage" shall have the meaning set forth in Section
    8.4(a).

         "Schedule of Contracts" shall have the meaning set forth in Section
    4.1(h).

         "Seller" shall have the meaning set forth in the first paragraph of
    this Agreement. 

         "Seller Party" shall have the meaning set forth in Section 4.7(a).

         "Seller's Affidavit" shall have the meaning set forth in
    Section 8.3(a)(ix).

         "Significant Tenant" shall mean any Tenant occupying space equal to
    twenty percent (20%) or more of the rentable square footage of any
    Property.

         "Survey" shall have the meaning set forth in Section 4.5(a).

         "Tenant" shall mean the tenant, occupier or licensee under any lease,
    license agreement or occupancy agreement encumbering the Property.

         "Threshold Amount" shall have the meaning set forth in Section 4.3.

         "Title Commitment" shall have the meaning set forth in Section 3.1(c).

         "Title Company" shall have the meaning set forth in Section 2.2(b).

         "Title Policy" shall have the meaning set forth in Section 5.2.

         "Warranties" shall have the meaning set forth in Section 2.1(f).

         Section 1.2  Terms Generally.  For all purposes of this Agreement, 
except as otherwise expressly provided or unless the context otherwise 
requires:

         (a)  the words "herein," "hereof" and "hereunder" and other words of 
similar import refer to this Agreement as a whole and not to any particular 
Article, Section or other subdivision;

         (b)  the words "including" and "include" and other words of similar 
import shall be deemed to be followed by the phrase "without limitation"; and

                                      -5-

<PAGE>

         (c)   any consent, determination, election or approval required to 
be obtained, or permitted to be given, by or of any party hereunder, shall be 
granted, withheld or made (as the case may be) by such party in the exercise 
of such party's sole and absolute discretion.

                                   ARTICLE II
                                           
                         PURCHASE AND SALE OF  PROPERTY

         Section 2.1  Sale.  Seller agrees to sell to Buyer, and Buyer agrees 
to purchase from Seller, subject only to the Permitted Exceptions and to all 
other terms, covenants and conditions set forth herein, all of Seller's 
right, title and interest in and to the following:  (a) each parcel of land 
described in Schedule 2.1.1 attached hereto (each, a "Fee Parcel") identified 
as being owned by Seller on Schedule 2.1.1, together with any and all rights, 
privileges and easements appurtenant thereto owned by Seller (including any 
rights of Seller as declarant), together with all buildings, improvements and 
fixtures (other than fixtures owned or removable by any Tenant or third 
party) located thereon (collectively, the "Improvements"; each Fee Parcel, 
together with the Improvements thereon, the "Real Property"; (b) 
[intentionally omitted]; (c) all tangible personal property not owned or 
removable by any Tenant or third party, if any, located on the Real  Property 
and owned by Seller and used in the operation or maintenance of the Real  
Property (the "Personal Property"); (d) (i) Seller's interest, as landlord, 
owner or licensor, in each of the Existing Leases, (ii) Seller's interest, as 
landlord, owner or licensor, in any New Leases and (iii) to the extent 
assignable, any guarantees, letters of credit or other instruments that 
secure or guarantee the performance of the obligations of each Tenant; (e) to 
the extent assignable, all service contracts, maintenance contracts, 
operating contracts, warranties, guarantees, listing agreements, parking 
contracts and like contracts and agreements relating to the Real Property, 
and commission agreements, equipment leases, contracts, subcontracts and 
agreements relating to the construction of any unfinished tenant improvements 
(collectively, the "Contracts"); (f) to the extent assignable, all warranties 
and guaranties made by or received from any third party with respect to any 
building, building component, structure, fixture, machinery, equipment or 
material situated on the Real Property, or contained in any or comprising a 
part of any Improvement or Leasehold Improvement (collectively, the 
"Warranties"); (g) to the extent Seller currently has such items in its 
possession and to the extent assignable, all (i) preliminary, final and 
proposed building plans and specifications (including "as-built" floor plans 
and drawings) and tenant improvement plans and specifications for the 
Improvements and (ii) surveys, grading plans, topographical maps, 
architectural and structural drawings and engineering, soils, seismic, 
geologic and architectural reports, studies and tests relating to the Real 
Property ((g)(i) and (g)(ii) collectively, the "Records and Plans"); and (h) 
to the extent transferable, any intangible personal property now or hereafter 
owned by Seller and used in the ownership, use or operation of the Real  
Property and/or the Personal Property, excluding materials or information 
which in Seller's judgment is privileged or confidential information, the 
name of Seller and related names and 

                                      -6-

<PAGE>

proprietary computer equipment, software and systems, but including all (i) 
licenses, permits, building inspection approvals, certificates of occupancy, 
approvals, subdivision maps and entitlements issued, approved or granted by 
Governmental Authorities in connection with the Real Property, (ii) 
unrecorded covenants, conditions and restrictions, reciprocal easement 
agreements, area easement agreements and other common or planned development 
agreements or documents affecting the Real Property and (iii) licenses, 
consents, easements, rights of way and approvals obtained from private 
parties to make use of utilities and to ensure vehicular and pedestrian 
ingress and egress for the Real Property ((h)(i), (h)(ii) and (h)(iii) 
collectively, the "Licenses and Permits") or other rights relating to the 
ownership, use or operation of any of the Real Properties or the Personal 
Property (collectively, the "Intangible Property"). The Real Property, 
together with the Personal Property, the Leases, the Contracts, the 
Warranties, the Records and Plans and the Intangible Property relating 
thereto are referred to herein as the "Property".

         Section 2.2  Purchase Price.

         (a)  The purchase price of the  Property is Nine Million Five 
Hundred Thousand Dollars ($9,500,000) (the "Purchase Price"), subject to 
prorations, credits and adjustments as set forth herein. 

         (b)  The Purchase Price shall be paid by Buyer as follows:

            (i)    By 3:00 P.M. (Eastern Standard Time) on the Initial 
Deposit Date, Buyer shall deposit by wire transfer (made in accordance with 
the wiring instructions set forth on Schedule 2.2.2 attached hereto) of 
immediately available funds, in escrow with Commonwealth Land Title Insurance 
Company, 1700 Market Street, Philadelphia, Pennsylvania 19103, Attention: Mr. 
Gordon Daniels (the "Title Company"), a cash payment in the amount of 
$475,000 (the "Deposit"). The Deposit shall be held by the Title Company 
pursuant to an escrow agreement among Buyer, Seller and the Title Company in 
the form of Exhibit N attached hereto.

           (ii)    The Deposit shall be held in an interest bearing account 
reasonably designated by Buyer and all interest thereon shall be deemed a 
part of the Deposit.  If the sale of the  Property as contemplated hereunder 
is consummated, then the Deposit (including the interest accrued on the 
Deposit) shall be paid to Seller at the consummation of the purchase and sale 
of the Property contemplated hereunder (the "Closing") and credited against 
the Purchase Price.

          (iii)    The balance of the Purchase Price over and above the 
Deposit, as adjusted pursuant to Section 8.5, shall be deposited by Buyer, by 
wire transfer (made in accordance with the wiring instructions set forth on 
Schedule 2.2.1 attached hereto) of immediately available funds, with the 
Title Company and paid to Seller at the Closing.

                                      -7-

<PAGE>


         (c) (i) IF THE SALE OF THE PROPERTY IS NOT CONSUMMATED DUE TO THE 
FAILURE OF ANY CONDITION TO BUYER'S OBLIGATION TO PURCHASE OR SELLER'S 
INABILITY TO PERFORM OR SELLER'S DEFAULT HEREUNDER, THEN THE DEPOSIT SHALL BE 
RETURNED TO BUYER, AND BUYER'S SOLE REMEDY, AT LAW OR IN EQUITY, SHALL BE THE 
RETURN OF THE DEPOSIT, PROVIDED, THAT IF THE SALE OF THE  PROPERTY IS NOT 
CONSUMMATED BECAUSE OF SELLER'S FAILURE TO CLOSE WHEN OBLIGATED TO DO SO 
UNDER THIS AGREEMENT, BUYER MAY EITHER (A) TERMINATE THIS AGREEMENT BY 
WRITTEN NOTICE OF TERMINATION TO SELLER ON THE CLOSING DATE, WHEREUPON THE 
DEPOSIT SHALL BE IMMEDIATELY RETURNED TO BUYER AND SELLER SHALL BE OBLIGATED 
TO REIMBURSE BUYER FOR ITS OUT OF POCKET EXPENSES (NOT TO EXCEED $25,000) OR 
(B) CONTINUE THIS AGREEMENT PENDING BUYER'S ACTION FOR SPECIFIC PERFORMANCE, 
IN WHICH LATTER EVENT BUYER, AS A CONDITION TO SUCH ACTION, SHALL NOT ACCEPT 
RETURN OF THE DEPOSIT AND SHALL PLACE THE FULL AMOUNT OF THE PURCHASE PRICE 
ABOVE THE DEPOSIT INTO ESCROW.  (ii) IF THE SALE OF THE  PROPERTY IS NOT 
CONSUMMATED AS A RESULT OF A DEFAULT BY BUYER HEREUNDER, THEN, AS ITS SOLE 
AND EXCLUSIVE REMEDY, SELLER SHALL RETAIN THE DEPOSIT AS LIQUIDATED DAMAGES.  
THE PARTIES HAVE AGREED THAT SELLER'S ACTUAL DAMAGES, IN THE EVENT OF A 
FAILURE TO CONSUMMATE THIS SALE DUE TO BUYER'S DEFAULT, WOULD BE EXTREMELY 
DIFFICULT OR IMPRACTICABLE TO DETERMINE.  AFTER NEGOTIATION, THE PARTIES HAVE 
AGREED THAT, CONSIDERING ALL THE CIRCUMSTANCES EXISTING ON THE DATE OF THIS 
AGREEMENT, THE AMOUNT OF THE DEPOSIT IS A REASONABLE ESTIMATE OF THE DAMAGES 
THAT SELLER WOULD INCUR IN SUCH EVENT.  BY PLACING THEIR INITIALS BELOW, EACH 
PARTY SPECIFICALLY CONFIRMS THE ACCURACY OF THE STATEMENTS MADE ABOVE AND THE 
FACT THAT EACH PARTY WAS REPRESENTED BY COUNSEL WHO EXPLAINED, AT THE TIME 
THIS AGREEMENT WAS MADE, THE CONSEQUENCES OF THIS LIQUIDATED DAMAGES 
PROVISION. THE FOREGOING IS NOT INTENDED TO LIMIT BUYER'S INDEMNITY 
OBLIGATIONS UNDER SECTIONS 4.6(a), 6.1, 9.4 AND 9.10(a) OR SELLER'S 
OBLIGATIONS UNDER SECTIONS 6.1 0R 9.4. 

         INITIALS:  Seller ___________ BUYER ___________

         (d)  In the event that Buyer fails to fund within one Business Day 
after the Initial Deposit Date or the Additional Deposit Date (with time 
being of the essence) the full amount of the Initial Deposit or the 
Additional Deposit, as the case may be, for any or no reason whatsoever in 
accordance with the terms of Section 2.2(b)(i), this Agreement shall 
immediately and automatically terminate.  Upon any termination of this 
Agreement pursuant to this Section 

                                      -8-

<PAGE>

2.2(d) or Section 2.3, no party shall have any further rights or obligations 
hereunder, except as provided in Sections 4.6(a), 6.1, 9.4 and 9.10(a).

         Section 2.3  Due Diligence. Buyer has reviewed, accepted and 
approved (and all representations and warranties of Seller made herein shall 
be subject to and qualified by) all of the Due Diligence Materials.  
Notwithstanding anything to the contrary herein, Seller shall have no 
liability whatsoever to Buyer with respect to any matter disclosed to or 
actually known by Buyer or its agents prior to the Closing Date.

                                  ARTICLE III

                              CONDITIONS PRECEDENT

         Section 3.1  Conditions to Buyer's Obligation to Purchase.  Buyer's 
obligation to purchase the  Property is conditioned upon the satisfaction (or 
Buyer's written waiver) on or prior to the Closing Date of the following 
conditions:

         (a)  There shall exist on the Closing Date no pending Order 
prohibiting, enjoining or restraining Seller from consummating the 
transactions contemplated hereby with respect to the Property.

         (b)  All consents required to be obtained from, or filing required 
to be made with, any Governmental Authority or third party in connection with 
the execution and delivery of this Agreement by Seller or the consummation by 
Seller of the transactions contemplated hereby shall have been obtained or 
made. 

         (c)  The Title Company has committed to issue,  upon payment of the 
applicable premium therefor, a 1992 ALTA Owner's Policy of Title Insurance 
(provided, that in jurisdictions where local regulations require a form of 
policy other than a 1992 ALTA Owner's Policy, such other required form shall 
be used) with respect to the Real Property in the form of the title insurance 
commitment (each, a "Title Commitment") obtained by Buyer from the Title 
Company and delivered to Seller prior to the Effective Date, showing title to 
the Real Property vested in Buyer, subject only to the Permitted Exceptions.  
It shall not be a condition to Closing that Buyer obtain any endorsements or 
coverages not set forth in the applicable Title Commitment.  Seller shall be 
entitled, by notice to Buyer, to adjourn the Closing one or more times for an 
aggregate period not to exceed thirty (30) days in order to remove any 
exceptions to title that are not Permitted Exceptions.  Nothing contained 
herein shall require Seller to bring any action or proceeding or otherwise to 
incur any expense to correct, discharge or otherwise remove title exceptions 
or defects with respect to the Property or to remove, remedy or comply with 
any other grounds for Buyer's refusing to approve title, provided that Seller 
shall be obligated to 

                                      -9-

<PAGE>

remove or discharge, or otherwise cause the Title Company to omit as an 
exception to title or to insure against collection thereof from or against 
the Property any mortgages or monetary liens created by Seller, any 
mechanics' liens or judgment liens that are the obligation of Seller (as 
opposed to any Tenant or other third party) and any liens and encumbrances 
voluntarily created by Seller in violation of Section 7.1 (collectively, the 
"Required Deletion Items").  If on the Closing Date there are any Required 
Deletion Items, Seller may use any portion of the Purchase Price payable 
pursuant to Section 2.2(b) to satisfy same, provided the Title Company shall 
omit such lien or encumbrance as an exception to title.

         (d)  Buyer shall have received estoppel certificates for the Real 
Property to the extent required by Section 8.4. 

         (e)  Each of the documents required to be delivered by Seller 
pursuant to Section 8.3 shall have been delivered as provided therein and 
Seller shall not otherwise be in material default of its material obligations 
hereunder, and all of Seller's representations and warranties contained 
herein shall be true and correct in all material respects as of the Closing 
Date (except that any representations and warranties which are made as of a 
specified date shall be true and correct as of such specified date).

         (f)  Buyer shall not have previously terminated this Agreement 
pursuant to and in accordance with Section 7.7.

         Section 3.2  Conditions to Seller's Obligations to Sell.  Seller's 
obligation to sell the  Property is conditioned upon the satisfaction (or 
Seller's written waiver) on or prior to the Closing Date of the following 
conditions:

         (a)  There shall exist on the Closing Date no pending Order 
prohibiting, enjoining or restraining Buyer from consummating the 
transactions contemplated hereby with respect to the Property.

         (b)  All consents required to be obtained from, or filings required 
to be made with, any Governmental Authority or third party in connection with 
the execution and delivery of this Agreement by Buyer or the consummation by 
Buyer of the transactions contemplated hereby shall have been obtained or 
made. 

         (c)  Seller shall have actually received the Purchase Price in cash.

         (d)  Buyer shall not otherwise be in material default of its material
obligations hereunder.

                                     -10-

<PAGE>


         (e)  Each of the documents required to be delivered by Buyer 
pursuant to Section 8.3 shall have been delivered as provided therein, and 
all of Buyer's representations and warranties contained herein shall be true 
and correct in all material respects as of the Closing Date.

         Section 3.3  Termination.  In the event that any condition set forth 
in Section 3.1 or Section 3.2 is not satisfied on or prior to the Closing 
Date, then the party to this Agreement whose obligations are conditioned upon 
the satisfaction of such condition may in its sole and absolute discretion 
terminate this Agreement, subject to Section 2.2(c), by written notice 
delivered to the other party at or prior to the occurrence of the Closing.  
Upon any termination of this Agreement pursuant to this Section 3.3, no party 
shall have any further rights or obligations hereunder, except as provided in 
Sections 2.2(c), 4.6(a), 6.1, 9.4 and 9.10(a).

         Section 3.4  Waiver by Buyer.  If Buyer and/or its Permitted 
Assignees, with knowledge of (i) a default in any of the covenants, 
agreements or obligations to be performed by Seller under this Agreement 
and/or (ii) any breach of or inaccuracy in any representation or warranty of 
Seller made in this Agreement, nonetheless elects to proceed to Closing, 
then, upon the consummation of the Closing, Buyer and/or its Permitted 
Assignees shall be deemed to have waived any such default and/or breach or 
inaccuracy and shall have no claim against Seller with respect thereto.

         Section 3.5  [Intentionally Omitted].



                                   ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES;
                      BUYER'S EXAMINATION OF THE  PROPERTY

         Section 4.1  Representations and Warranties of Seller.  Subject to 
(i) the provisions of Sections 2.3, 4.2 and 4.3 and (ii)  the information 
disclosed in the Due Diligence Materials (except that the representations and 
warranties in clauses (a), (b), (c) and (d) of this Section 4.1 shall not be 
subject to the information disclosed in the Due Diligence Materials), Seller 
hereby makes the following representations and warranties: 

         (a)  Seller has not (i) made a general assignment for the benefit of 
creditors, (ii) filed any voluntary petition in bankruptcy or suffered the 
filing of any involuntary petition by Seller's creditors, (iii) suffered the 
appointment of a receiver to take possession of any of the  Property or all, 
or substantially all, of Seller's other assets, (iv) suffered the attachment 
or other judicial seizure of any of the  Property or all, or substantially 
all, of Seller's other assets, (v) 

                                     -11-

<PAGE>

admitted in writing its inability to pay its debts as they come due, or (vi) 
made an offer of settlement, extension or composition to its creditors 
generally.

         (b)  Seller is not a "foreign person" as defined in Section 1445 of 
the Code and any related regulations.

         (c)  Seller is duly organized and validly existing and in good 
standing under the laws of its state of formation.  Seller further represents 
and warrants that this Agreement and all documents executed by Seller that 
are to be delivered to Buyer at Closing (i) are, or at the time of Closing 
will be, duly authorized, executed and delivered by Seller, (ii) do not, and 
at the time of Closing will not, violate any provision of any agreement or 
judicial order to which Seller is a party or to which Seller or the Property 
owned by Seller is subject and (iii) constitute (or in the case of Closing 
documents will constitute) a valid and legally binding obligation of Seller, 
enforceable in accordance with its terms.

         (d)  Seller has full and complete power and authority to enter into 
this Agreement and, subject to obtaining any consents or waivers required to 
be obtained prior to Closing, to perform its obligations hereunder.

         (e)  Seller is not aware of any consents required for the 
performance of  Seller's obligations hereunder except as set forth on 
Schedule 4.1.1.

         (f)  The Due Diligence Materials contain true, correct and complete 
copies of all Existing Leases, all material Contracts and all environmental 
and structural reports in the possession of Seller.  This representation 
shall not be deemed breached by virtue of any Leases or Contracts entered 
into after the Effective Date in accordance with Section 7.1.

         (g)  Except as included in the Due Diligence Materials (including 
the rent rolls, dated October 9, 1997, delivered to Buyer (the "Rent 
Rolls")), (i) there are to Seller's knowledge no leases, license agreements 
or occupying agreements (or any amendments or supplements thereto) 
encumbering, or in force with respect to, the Property (except for any New 
Leases entered into after the Effective Date in accordance with Section 7.1) 
and (ii) as of the Effective Date, Seller has not received written notice 
from any Significant Tenant that Seller has not performed its material 
obligations under such Significant Tenant's Lease.

         (h)  To Seller's knowledge, the only Contracts and amendments 
thereto that will be in effect on the Closing Date that are not terminable 
without cause or penalty on sixty (60) days notice with respect to the 
Property (the "Non-Terminable Contracts") are as set forth in Schedule 4.1.2 
(the "Schedule of Contracts") or as entered into in accordance with Section 
7.1.

                                     -12-

<PAGE>


         (i)  As of the Effective Date, Seller has not received any written 
notice of any pending or threatened condemnation of all or any portion of the 
Property.

         (j)  Seller has not received written notice of any litigation that 
is pending or threatened with respect to the Property, except (i) litigation 
fully covered by insurance policies (subject to customary deductibles) or 
(ii) litigation set forth in Schedule 4.1.3.

         (k)  As of the Effective Date, except as set forth in Schedule 
4.1.4, Seller has not received any written notice from any Governmental 
Authority that all or any portion of the Property is in material violation of 
any applicable building codes or any applicable environmental law (relating 
to clean-up or abatement), zoning law or land use law, or any other 
applicable local, state or federal law or regulation relating to the 
Property, which material violation has not been cured or remedied prior to 
the Effective Date.

         (l)  Except as set forth in Schedule 2.1.5 or Schedule 4.1.1 
attached to this Agreement, Seller has not granted any option or right of 
first refusal or first opportunity to any party to acquire any fee or ground 
leasehold interest in any portion of any Property.

         (m)  Employees.  Seller will have no employees at Closing, and any 
employees of Seller existing on the date hereof shall have been terminated by 
Seller prior to Closing in accordance with all applicable law, non-compliance 
with which could result in a claim against Buyer.  Buyer shall not be 
responsible for, nor assume any liabilities of Seller regarding any such 
employees.

         Each of the representations and warranties of Seller contained in 
this Section 4.1:  (1) is made as of the Effective Date (subject to the 
information disclosed in the Due Diligence Materials); (2) other than clauses 
(i) and (k) above (which, in the case of clause (i) above, the parties 
acknowledge shall be governed by Section 7.7 with respect to events occurring 
after the Effective Date) shall be deemed remade by Seller, and shall be true 
in all material respects, as of the Closing Date (except that any 
representations and warranties which are made as of a specified date, shall 
have been true and correct as of such specified date) subject to (A) the 
information disclosed in the Due Diligence Materials, (B) litigation that is 
not reasonably likely to have a material adverse effect on the Property, and 
(C) other matters expressly permitted in this Agreement or otherwise 
specifically approved in writing by Buyer; and (3) shall survive the Closing 
only as and to the extent expressly provided in Section 4.2 and Section 4.3. 

         Section 4.2  Estoppels.  The representations and warranties of 
Seller regarding Leases in Section 4.1(f) or 4.1(g) or in any estoppel 
delivered by Seller pursuant to Section 8.4 shall terminate to the extent 
specifically confirmed by a tenant estoppel certificate delivered by a Tenant.

                                     -13-

<PAGE>


         Section 4.3  Limitation on Claims; Survival of Representations and 
Warranties.  

         (a)  Notwithstanding any provision to the contrary herein or in any 
document or instrument (including, without limitation, any deeds or 
assignments) executed by Seller and delivered to Buyer or any Permitted 
Assignee at or in connection with the Closing (collectively, "Closing 
Documents"), Seller shall have no liability whatsoever with respect to any 
suits, actions, proceedings, investigations, demands, claims, liabilities, 
fines, penalties, liens, judgments, losses, injuries, damages, expenses or 
costs, including, without limitation, attorneys' and experts' fees and costs 
and investigation, and remediation costs (collectively "Claims") under, and 
Buyer shall be barred from bringing any Claims with respect to, any of the 
representations and warranties contained in this Agreement or in any Closing 
Document, except to the extent (and only to the extent) that (i) with respect 
to Claims for breach of representations and warranties relating to the 
Property, the amount of such Claims exceeds One Hundred Thousand Dollars 
($100,000) ("Threshold Amount") and, in such case, such Claims shall only be 
valid (and the Seller shall only be liable) for the portion that exceeds the 
Threshold Amount; provided, however, notwithstanding any provision to the 
contrary herein or in any Closing Document, the (i) total liability of Seller 
for any or all Claims (inclusive of Claims with respect to any estoppel 
certificates delivered by Seller pursuant to Section 8.4(a)) with respect  
the Property shall not exceed two and three quarters percent (2.75%) of the 
Purchase Price.  Further notwithstanding any provision to the contrary herein 
or in any Closing Document, Seller shall have no liability with respect to 
any Claim under any of the representations and warranties contained in this 
Agreement or in any Closing Document, which Claim relates to or arises in 
connection with (1) any Hazardous Materials (except solely to the extent that 
Seller has breached its representation in Section 4.1(k)), (2) the physical 
condition of  the Property (except solely to the extent that Seller has 
breached its representation in Section 4.1(k)) or (3) any other matter not 
expressly set forth in the Seller's representations and warranties set forth 
in Section 4.1.  Buyer shall not make any Claim or deliver any Claim Notice 
unless it in good faith believes the Claims would exceed the Threshold Amount 
provided in this Section 4.3(a).

         (b)  Except as otherwise specifically set forth in this Agreement, 
the representations and warranties of Seller contained herein or in any 
Closing Document shall survive only until July 6, 1998.  Any Claim that Buyer 
may have at any time against Seller for a breach of any such representation 
or warranty, whether known or unknown, with respect to which a Claim Notice 
has not been delivered to Seller on or prior to July 6, 1998 shall not be 
valid or effective. For the avoidance of doubt, on July 6, 1998, Seller shall 
be fully discharged and released (without the need for separate releases or 
other documentation) from any liability or obligation to Buyer, any Permitted 
Assignee and/or their successors and assigns with respect to any Claims or 
any other matter relating to this Agreement, any Closing Document or the  
Property, except solely for those matters that are then the subject of a 
pending Claim Notice delivered by Buyer to Seller.  Any Claim that Buyer may 
have at any time against Seller for a breach of any such representation or 
warranty, whether known or unknown, with respect to 

                                     -14-

<PAGE>

which a Claim Notice has been delivered to Seller on or prior to July 6, 1998 
may be the subject of subsequent litigation brought by Buyer against Seller, 
provided that such litigation is commenced against Seller on or prior to 
October 6, 1998.  For the avoidance of doubt, on October 6, 1998, Seller 
shall be fully discharged and released (without the need for separate 
releases or other documentation) from any liability or obligation to Buyer 
and/or its successors and assigns with respect to any Claims or any other 
matter relating to this Agreement, any Closing Document or the  Property, 
except solely for those matters that are the subject of a litigation by Buyer 
against Seller that is pending on October 6, 1998.

         (c)   This Section 4.3 shall survive the Closing.

         Section 4.4  Representations and Warranties of Buyer.  Buyer hereby 
makes the following representations and warranties:

         (a)  Buyer is a limited partnership duly organized and validly 
existing and in good standing under the laws of the State of Delaware.  Buyer 
further represents and warrants to Seller that this Agreement and all 
documents executed by Buyer that are to be delivered to Seller at Closing (i) 
are, or at the time of Closing will be, duly authorized, executed and 
delivered by Buyer, (ii) do not, and at the time of Closing will not, violate 
any provision of any agreement or judicial order to which Buyer is a party or 
to which Buyer or any property owned by Buyer is subject and (iii) 
constitutes (or in the case of Closing documents will constitute) a valid and 
legally binding obligation of Buyer, enforceable in accordance with its terms.

         (b)  Buyer has not (i) made a general assignment for the benefit of 
creditors, (ii) filed any voluntary petition in bankruptcy or suffered the 
filing, of any involuntary petition by Buyer's creditors, (iii) suffered the 
appointment of a receiver to take possession of all, or substantially all, of 
Buyer's assets, (iv) suffered the attachment or other judicial seizure of 
all, or substantially all, of Buyer's assets, (v) admitted in writing its 
inability to pay its debts as they come due, or (vi) made an offer of 
settlement, extension or composition to its creditors generally.  As of the 
Closing Date, Buyer will have sufficient funds to pay the Purchase Price and 
consummate the transactions contemplated by this Agreement.

         (c)  Buyer has full and complete power and authority to enter into 
this Agreement and to perform its obligations hereunder.

         (d)  Buyer (i) is a sophisticated investor, (ii) is represented by 
competent counsel and (iii) understands the assumptions of risk and liability 
set forth in this Agreement.

         (e)  No consents are required to be obtained from, and no filings 
are required to be made with, any Governmental Authority or third party in 
connection with the execution and 

                                     -15-

<PAGE>

delivery of this Agreement by Buyer or the consummation by Buyer of the 
transactions contemplated hereby.

         Each of the representations and warranties of Buyer contained in 
this Section (i) is made on the Effective Date; (ii) shall be deemed remade 
by Buyer and/or its assignee(s), as applicable and appropriate, and shall be 
true in all material respects, as of the Closing Date; and (iii) shall 
survive the Closing until July 6, 1998.

         Section 4.5  Buyer's Independent Investigation.

         (a)  Buyer, for itself and any successors or assigns (including any 
Permitted Assignees), acknowledges and agrees that it has been given the full 
opportunity to inspect and investigate each and every aspect of the Property, 
either independently or through agents, representatives or experts of Buyer's 
choosing, as Buyer considers necessary or appropriate, and that Buyer is 
completely satisfied with such independent investigation (but the foregoing 
will not constitute a waiver of any breach of representation or warranty set 
forth in Section 4.1 unless such breach is disclosed in the Due Diligence 
Materials or is otherwise known by Buyer and/or any Permitted Assignee before 
the Closing Date and Buyer and/or such Permitted Assignee(s) elect to proceed 
with the Closing). Such independent investigation by Buyer may include, 
without limitation:

              (i)  all matters relating to title to the Property;

              (ii)  all matters relating to governmental and other legal 
requirements with respect to the Property, such as taxes, assessments, 
zoning, use permit requirements and building codes;

              (iii)  all zoning, land use, building, environmental and other 
statutes, rules, or regulations applicable to the Real Property;

              (iv)  the physical condition of  the Real Property, including, 
without limitation, the interior, the exterior, the square footage of the 
Improvements and of each tenant space therein, the structure, the roof, the 
paving, the utilities, and all other physical and functional aspects of  the 
Real Property, including the presence or absence of Hazardous Materials;

              (v)  any easements and/or access rights affecting  the Real 
Property;

              (vi)  the Leases with respect to  the Real Property and all 
matters in connection therewith, including, without limitation, the ability 
of the Tenants thereto to pay the rent;

                                     -16-

<PAGE>

              (vii)  the Contracts and any other documents or agreements of 
significance affecting such Property;

              (viii)  all matters that would be revealed by an ALTA as-built 
survey (a "Survey"), a physical inspection or an environmental site 
assessment of  the Real Property;

              (ix) all matters relating to the income and operating or 
capital expenses of the  Property and all other financial matters; and

              (x)  all other matters of significance affecting, or otherwise 
deemed relevant by Buyer with respect to, such Property.

         (b)  The Due Diligence Materials heretofore delivered or made 
available to Buyer for its review and approval include:

              (i) to the extent in the possession of Seller, a copy of a 
Survey of  the Real Property;

              (ii)  a Rent Roll for  the Real Property, listing for any 
Tenant the name, rent, amount of deposit and prepaid rent, if any, and lease 
term and copies of the Existing Leases;

              (iii)  the Schedule of Contracts;

              (iv)  operating, income and expense statements for  the Real 
Property for the period in 1997 ending September 30, 1997;

              (v)  copies of all Licenses and Permits in the possession of 
Seller;

              (vi)  to the extent in the possession of Seller or Seller's 
property manager, reports, studies, assessments, investigations and other 
materials related to the presence of Hazardous Materials at, on or under  the 
Real Property and the compliance of  the Real Property with all environmental 
laws, including recent Phase I (and, in some cases, Phase II) environmental 
surveys; and

              (vii)  to the extent in the possession of Seller or Seller's 
property manager, copies of (i) the bills issued for the most recent year for 
the Real Property for all real estate taxes and assessments, water rates, 
water meter charges, sewer rates, sewer charges, and similar matters, imposed 
by any Governmental Authority ("Real Estate Taxes") and personal property 
taxes and (ii) all notices or documents for any assessments or bonds relating 
to  the Real Property.

                                     -17-

<PAGE>


         (c)  Buyer acknowledges and agrees that (i) it has completed its 
independent investigation of the  Property and the Due Diligence Materials 
and shall have obtained, reviewed and approved a Title Commitment for  the 
Property, (ii) it is acquiring the  Property based on such independent 
investigation and subject to all information disclosed in the Due Diligence 
Materials (and also in reliance on Seller's representations and warranties 
contained herein) and (iii) Buyer shall have no right to terminate this 
Agreement based on any further investigations of the  Property or the Due 
Diligence Materials.  Borrower has approved each and every aspect of such  
Property.  The preceding sentence is not intended to relieve, and shall not 
relieve, Seller from any of its obligations under Section 4.1.  

         (d)  BUYER SPECIFICALLY ACKNOWLEDGES AND AGREES THAT (i) SELLER 
SHALL SELL AND BUYER SHALL PURCHASE EACH PROPERTY "AS IS, WHERE IS AND WITH 
ALL FAULTS," (ii) EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, BUYER IS 
NOT RELYING ON ANY REPRESENTATIONS OR WARRANTIES OF ANY KIND WHATSOEVER, 
WHETHER ORAL OR WRITTEN, EXPRESS OR IMPLIED, STATUTORY OR OTHERWISE, FROM 
SELLER, NOR ANY PARTNER, OFFICER, EMPLOYEE, ATTORNEY, AGENT OR BROKER OF 
SELLER, AS TO ANY MATTER, CONCERNING ANY PROPERTY, OR SET FORTH, CONTAINED OR 
ADDRESSED IN THE DUE DILIGENCE MATERIALS (INCLUDING WITHOUT LIMITATIONS, THE 
COMPLETENESS THEREOF), INCLUDING WITHOUT LIMITATION: (i) the quality, nature, 
habitability, merchantability, use, operation, value, marketability, adequacy 
or physical condition of  the Property or any aspect or portion thereof, 
including, without limitation, structural elements, foundation, roof, 
appurtenances, access, landscaping, parking facilities, electrical, 
mechanical, HVAC, plumbing, sewage, and utility systems, facilities and 
appliances, soils, geology and groundwater, (ii) the dimensions or lot size 
of  the Real Property or the square footage of the Improvements thereon or of 
any tenant space therein, (iii) the development or income potential, or 
rights of or relating to,  the Real Property, or  the Real Property's use, 
habitability, merchantability, or fitness, or the suitability, value or 
adequacy of  the Real Property for any particular purpose, (iv) the zoning or 
other legal status of  the Real Property or any other public or private 
restrictions on the use of  the Real Property, (v) the compliance of the Real 
Property or its operation with any applicable codes, laws, regulations, 
statutes, ordinances, covenants, conditions and restrictions of any 
Governmental Authority or of any other person or entity (including, without 
limitation, the Americans with Disabilities Act), (vi) the ability of Buyer 
to obtain any necessary governmental approvals, licenses or permits for 
Buyer's intended use or development of  the Real Property, (vii) the presence 
or absence of Hazardous Materials on, in, under, above or about  the Real 
Property or any adjoining or neighboring property, (viii) the quality of any 
labor and materials used in any Improvements, (ix) the condition of title to  
the Real Property, (x) the Leases, Contracts or any other agreements 
affecting  the Real Property or the intentions of any party with respect to 
the negotiation and/or execution of any lease or contract with respect to  
the Real Property, (xi) Seller's ownership of  the Property or any portion 
thereof or (xii) the economics of, or the income and expenses, 

                                         -18-

<PAGE>

revenue or expense projections or other financial matters, relating to, the 
operation of  the Real Property.  Without limiting the generality of the 
foregoing, except as otherwise set forth herein, Buyer expressly acknowledges 
and agrees that Buyer is not relying on any representation or warranty of 
Seller, nor any partner, officer, employee, attorney, agent or broker of 
Seller, whether implied, presumed or expressly provided at law or otherwise, 
arising by virtue of any statute, common law or other legally binding right 
or remedy in favor of Buyer.  Buyer further acknowledges and agrees that 
Seller is under no duty to make any inquiry regarding any matter that may or 
may not be known to Seller or any partner, officer, employee, attorney, agent 
or broker of Seller. This Section 4.5(d) shall survive the Closing, or, if 
the Closing does not occur, beyond the termination of this Agreement.

         (e)  ANY REPORTS, REPAIRS OR WORK REQUIRED BY BUYER ARE THE SOLE 
RESPONSIBILITY OF BUYER, AND BUYER AGREES THAT THERE IS NO OBLIGATION ON THE 
PART OF SELLER TO MAKE ANY CHANGES, ALTERATIONS OR REPAIRS TO  THE PROPERTY 
OR TO CURE ANY VIOLATIONS OF LAW OR TO COMPLY WITH THE REQUIREMENTS OF ANY 
INSURER. BUYER IS SOLELY RESPONSIBLE FOR OBTAINING ANY CERTIFICATE OF 
OCCUPANCY OR ANY OTHER APPROVAL OR PERMIT NECESSARY FOR TRANSFER OR OCCUPANCY 
OF  THE PROPERTY AND FOR ANY REPAIRS OR ALTERATIONS NECESSARY TO OBTAIN THE 
SAME, ALL AT BUYER'S SOLE COST AND EXPENSE.

         Section 4.6  Entry and Indemnity; Limits on Government Contacts.  

         (a)  In connection with any entry by Buyer, its Permitted 
Assignee(s) or any of their agents, employees or contractors (collectively, 
the "Buyer Parties" and each a "Buyer Party") onto the Real Property, Buyer 
shall give Seller reasonable advance notice of such entry and shall conduct 
such entry and any inspections in connection therewith so as to minimize, to 
the greatest extent possible, interference with Seller's business and the 
business of the Tenants and otherwise in a manner reasonably acceptable to 
Seller.  Without limiting the foregoing, prior to any entry to perform any 
necessary on-site testing, Buyer shall give Seller written notice thereof, 
including the identity of the company or persons who will perform such 
testing and the proposed scope of the testing and the party performing the 
testing.  Seller shall approve or disapprove any proposed testing and the 
party performing the same within three (3) Business Days after receipt of 
such notice.  If a Buyer Party takes any sample from the Real Property in 
connection with any such approved testing, Buyer shall provide to Seller a 
portion of such sample being tested to allow Seller, if it so chooses, to 
perform its own testing.  Seller or its representative may be present to 
observe any testing, or other inspection performed on  the Real Property.  
Buyer shall promptly deliver to Seller copies of any reports relating to any 
testing or other inspection of  the Real Property performed by or on behalf 
of any Buyer Party.  Buyer shall maintain, and shall ensure that its 
contractors maintain, public liability and property damage insurance insuring 
the Buyer Parties against any liability arising out of any entry or 
inspections of

                                         -19-

<PAGE>

the Real Property pursuant to the provisions hereof.  Such insurance 
maintained by Buyer shall be in the amount of Ten Million Dollars 
($10,000,000) combined single limit for injury to or death of one or more 
persons in an occurrence, and for damage to tangible property (including loss 
of use) in an occurrence.  The policy maintained by Buyer shall insure the 
contractual liability of Buyer covering the indemnities herein and shall (i) 
name Seller (and their successors, assigns and Affiliates) as additional 
insureds, (ii) contain a cross-liability provision, and (iii) contain a 
provision that "the insurance provided by Buyer hereunder shall be primary 
and noncontributing with any other insurance available to Seller."  Buyer 
shall provide Seller with evidence of such insurance coverage prior to any 
entry or inspection of  the Real Property. Buyer shall indemnify and hold the 
Seller Parties harmless from and against any Claims arising out of or 
relating to any entry on  the Real Property by any Buyer Party, in the course 
of performing any inspections, testings or inquiries. The foregoing indemnity 
shall survive the Closing, or, if the Closing does not occur, beyond the 
termination of this Agreement.

         (b)  Notwithstanding any provision in this Agreement to the 
contrary, neither Buyer nor any other Buyer Party shall contact any 
Governmental Authority regarding any Hazardous Materials on or the 
environmental condition of  the Real Property without Seller's prior written 
consent thereto; provided that if Buyer or Buyer's consultant is 
unconditionally obligated by applicable law to notify a Governmental 
Authority regarding any Hazardous Materials on, or the environmental 
condition of,  the Real Property discovered by Buyer's environmental testing, 
Buyer shall first provide prior written notice to Seller and shall not 
contact any Governmental Authority except in conjunction with Seller.  In 
addition, if Seller's consent is obtained by Buyer, Seller shall be entitled 
to receive at least five (5) Business Days prior written notice of the 
intended contact and to have a representative present when Buyer has any such 
contact with any governmental official or representative.

         Section 4.7  Release.  

         (a)  Without limiting the provisions of Section 4.5, Buyer, for 
itself and any successors and assigns of Buyer (including, without 
limitation, any Permitted Assignee), waives its right to recover from, and 
forever releases and discharges, and covenants not to sue, Seller, Seller's 
Affiliates, Seller's asset manager, any lender to Seller, the partners, 
trustees, shareholders, controlling persons, LLC Members, directors, 
officers, attorneys, employees and agents of each of them, and their 
respective heirs, successors, personal representatives and assigns (each a 
"Seller Party", and collectively, the "Seller Parties") with respect to any 
and all Claims, whether direct or indirect, known or unknown, foreseen or 
unforeseen, that may arise on account of or in any way be connected with  the 
Property including, without limitation, the physical, environmental and 
structural condition of the Real Property or any law or regulation applicable 
thereto, including, without limitation, any Claim or matter relating to the 
use, presence, discharge or release of Hazardous Materials on, under, in, 
above or about  the Real Property; provided, however, Buyer does not waive 
its rights, if any, to recover from, and does 

                                         -20-

<PAGE>

not release or discharge or covenant not to sue Seller for (i) any act that 
is found by a court of competent jurisdiction to constitute fraud, (ii) any 
breach of Seller's representations or warranties set forth in Section 4.1 or 
in Seller's estoppel certificate delivered pursuant to Section 8.4, subject 
to the limitations and conditions provided in this Agreement, or (iii) any 
breach of Seller's obligations set forth in this Agreement that expressly 
survive Closing.

         (b)   This Section 4.7 shall survive the Closing indefinitely.

                                      ARTICLE V

                                        TITLE

         Section 5.1  Conveyance of Title.  Buyer has obtained a Title 
Commitment for  the Property.  A copy of each Title Commitment delivered to 
Buyer has been delivered to Seller and its counsel.  At the Closing, as a 
condition precedent to Buyer's obligation to close, Seller shall have 
delivered to Buyer a deed for the Real Property in the form of Exhibit A 
(each, a "Deed"), each subject to no exceptions other than the following (the 
"Permitted Exceptions"):

              (i)  Interests and rights of Tenants in possession under 
Existing Leases and New Leases, including, without limitation, those Tenant 
purchase rights listed on Schedule 2.1.5;

              (ii)  Liens for Real Estate Taxes that are apportioned as 
provided in Section 8.5 (including special assessments and special 
improvement district or local improvement district bonds);

              (iii)  Any exceptions, exclusions and other matters set forth 
in or disclosed by the Title Commitment for  the Real Property or other 
documents made available to Buyer and any other exceptions to title that 
would be disclosed by an inspection and/or survey of  the Real Property, 
including those disclosed on a Survey;

              (iv)  Any and all present and future laws, ordinances, 
restrictions, requirements, resolutions, orders, rules and regulations of any 
Governmental Authority, as now or hereafter existing or enforced (including, 
without limitation, those related to zoning and land use), and all notes or 
notices of violation of any such laws, ordinances, rules or regulations set 
forth in the Due Diligence Materials or in any title reports, commitments or 
updates delivered to Buyer prior to the Effective Date;

              (v)  Any lien or encumbrance encumbering such Property as to 
which Seller shall deliver to Buyer, or the Title Company, at or prior to the 
Closing, proper instruments, 

                                         -21-
<PAGE>

in recordable form, canceling such lien or encumbrance, together with funds 
to pay the cost of recording and canceling the same;

              (vi)  Such other exceptions as the Title Company shall commit 
to insure over in a manner reasonably satisfactory to Buyer, without any 
additional cost to Buyer, whether such insurance is made available in 
consideration of payment, bonding or indemnity by Seller or otherwise;

              (vii)     Uniform Commercial Code filings that have expired or 
terminated by operation of law on or prior to the Closing Date;

              (viii)  Any exceptions caused by Buyer, its agents, 
representatives or employees; and

              (ix)  Any other matters affecting title to such Property that 
have been approved or waived by Buyer pursuant to the terms hereof.

The acceptance by Buyer of the Deeds shall be deemed to be a full performance 
and discharge of every obligation on the part of Seller to be performed under 
this Agreement with respect to the Property, other than those that are 
specifically stated herein to survive the Closing.

         Section 5.2  Evidence of Title.  Delivery of title in accordance 
with the foregoing shall be evidenced by the Title Company issuing, or to 
committing to issue, at Closing, upon payment of the applicable premium 
therefor, a 1992 ALTA Owner's Policy of Title Insurance (provided, that in 
jurisdictions where local regulations require a form of policy other than a 
1992 ALTA Owner's Policy, such other required form shall be used) in the 
amount of the Purchase Price showing title to  the Property vested in Buyer 
or its Permitted Assignee or designee, subject only to the Permitted 
Exceptions (the "Title Policy").

                                      ARTICLE VI

                                 BROKERS AND EXPENSES

         Section 6.1  Brokers.  Seller and Buyer represent and warrant to 
each other that no broker or finder, other GMH Realty, Inc. ("GMH"), whose 
fees will be the responsibility of Seller pursuant to a separate agreement 
among between GMH and Seller, was instrumental in arranging or bringing about 
this transaction and that there are no claims or rights for brokerage 
commissions or finders' fees in connection with the transactions contemplated 
hereby by any person or entity other than GMH.  If any person brings a claim 
for a commission or finder's fee based upon any contact, dealings or 
communication with Buyer or Seller, then the party through 

                                         -22-
<PAGE>

whom such person makes its claim shall defend the other party (the 
"Indemnified Party") from such claim, and shall indemnify the Indemnified 
Party and hold the Indemnified Party harmless from any and all costs, 
damages, claims, liabilities or expenses (including without limitation, 
reasonable attorneys' fees and disbursements) incurred by the Indemnified 
Party in defending against the claim. The provisions of this Section 6.1 
shall survive the Closing or, if the Closing does not occur, any termination 
of this Agreement.

         Section 6.2  Expenses.  Except as provided in Section 8.5(e), each 
party hereto shall pay its own expenses incurred in connection with this 
Agreement and the transactions contemplated hereby.

                                     ARTICLE VII

                          INTERIM OPERATION OF THE  PROPERTY

         Section 7.1  Interim Operation of the  Property.  

         (a)  Except as otherwise contemplated or permitted by this Agreement 
or approved by Buyer in writing, from the Effective Date to the Closing Date, 
Seller agrees that it will operate, maintain, repair and lease the Real 
Property in the ordinary course, on an arm's-length basis and consistent with 
Seller's past practices and will not dispose of or encumber  the Property, 
except for dispositions of personal property in the ordinary course of 
business or as otherwise permitted by Section 7.1 or Section 7.3.  Without 
limiting the foregoing, Seller shall, in the ordinary course, negotiate with 
prospective Tenants and enter into New Leases (on terms that Seller believes, 
in its good faith business judgment, to be market terms), enforce Leases in 
all material respects, perform in all material respects all of landlord's 
obligations under the Leases (other than Leases that are or that are in the 
process of being terminated due to Tenant's default thereunder, provided that 
this provision shall not be deemed breached by virtue of Seller's failure to 
perform under Leases expiring on or before December 30, 1997) and pay all 
costs and expenses of the  Property, including without limitation debt 
service and Real Estate Taxes.

         (b)  Seller shall not, without Buyer's consent, enter into any New 
Leases or materially modify any Existing Lease.  Any consent to be given by 
Buyer pursuant to this Section 7.1(b) shall not be unreasonably withheld or 
delayed and shall be deemed granted if Buyer does not respond in writing to 
Seller's request for consent within three (3) Business Days. 

         (c)  Seller shall not enter into or terminate any operating 
agreement or any contract, agreement or other commitment of any sort 
(including any contract for capital items or expenditures, but excluding any 
liens or other encumbrances on title other than Permitted 

                                         -23-

<PAGE>

Exceptions), with respect to the Property that (A) requires payments to or by 
Seller in excess of $50,000 per annum, or the performance of services by 
Seller the value of which is in excess of $50,000 per annum and (B) is not 
terminable without cause and without penalty on thirty (30) days' notice or 
less; provided that Seller, in its good faith but sole discretion, believes 
such contract is on market terms and will benefit the Property. At least 
three (3) Business Days prior to becoming legally bound with respect to any 
such matter, Seller shall consult with and seek the consent of Buyer, and 
shall provide reasonable detail to Buyer (including, at Buyer's request, 
copies of the relevant documentation), with respect thereto.  Any consent to 
be given by Buyer pursuant to this Section 7.1(c) shall not be unreasonably 
withheld or delayed and shall be deemed granted if Buyer does not respond in 
writing to Seller's request for consent within three (3) Business Days. 

         (d)  Except for New Leases or other agreements entered into in 
accordance with this Section 7.1, Seller shall not enter into any agreement 
to create a lien or encumbrance on  the Property without Buyer's prior 
written consent (which consent shall not be unreasonably withheld or delayed 
with respect to any utility or similar easement necessary for the operation 
of the Property, and which shall be deemed granted if Buyer does not respond 
in writing to Seller's request for consent within three (3) Business Days).

         (e)  Prior to the Closing Date or the earlier termination of this 
Agreement, Seller shall not sell  the Property or portion thereof without 
Buyer's prior written consent.

         (f)  Within three (3) days after the execution thereof, Seller shall 
provide Buyer with copies of all Contracts entered into by Seller after the 
Effective Date affecting  the Property (other than Contracts terminable on 30 
days' notice or less), and all operating statements, rent rolls, receivable 
aging reports, leasing reports and other periodic reports prepared by or 
delivered to Seller.

         Section 7.2  Tenant Improvement Costs, Leasing Commissions and Free 
Rent.  If the Closing occurs, Buyer shall be responsible and shall pay for 
the costs of tenant improvement work or allowances, third-party leasing 
commissions and other leasing costs (collectively, "Leasing Costs") relating 
to or arising from (i) those Leases or modifications of Leases entered into 
on or after October 9, 1997  (ii) the exercise by a Tenant of a renewal, 
expansion or extension option contained in any Lease, which renewal or 
extension period commences, or which expansion space such Tenant first has 
the right to occupy, on or after October 9, 1997 (notwithstanding that such 
Tenant may have exercised such option prior to October 9, 1997 and (iii) any 
items set forth on Schedule 7.2.1, and any amounts paid by Seller in respect 
of such Leasing Costs shall result in an upward adjustment to the Purchase 
Price at Closing equal to the amounts so paid. Free rent periods provided for 
in Leases entered into by Seller prior to October 9, 1997 that occur, in 
whole or in part, after the Closing Date shall be for 

                                         -24-

<PAGE>

the account of, and borne by, Buyer without adjustment to the Purchase Price 
at closing.  The provisions of this Section 7.2 shall survive the Closing.

         Section 7.3  Seller's Maintenance of the  Property.  Between the 
Effective Date and the Closing Date, Seller shall (a) maintain  the Real 
Property in substantially the same manner as prior hereto pursuant to 
Seller's normal course of business, subject to reasonable wear and tear and 
further subject to the occurrence of any damage or destruction to  the Real 
Property by casualty or other causes or events beyond the control of Seller; 
provided, however, that Seller's maintenance obligations under this Section 
7.3 shall not include any obligation to make capital expenditures not 
incurred in Seller's normal course of business or any other expenditures not 
incurred in Seller's normal course of business; (b) continue to maintain its 
existing insurance coverage; and (c) not grant any voluntary liens or 
encumbrances affecting such Property other than Permitted Exceptions of the 
type described in clauses (i) and (ix) of Section 5.1.

         Section 7.4  Lease Enforcement.  Subject to the provisions of 
Section 7.1, prior to the Closing Date, Seller shall have the right, but not 
the obligation, to enforce the rights and remedies of the landlord under any 
Lease or New Lease, by summary proceedings or otherwise, and to apply all or 
any portion of any security deposits then held by Seller toward any loss or 
damage incurred by Seller by reason of any defaults by any Tenant, provided, 
that (i) with respect to delinquent rents, Seller may (to the extent 
permitted under the Lease) apply Tenant security deposits held by Seller only 
to rents that are thirty (30) days or more past due and (ii) with respect to 
any application by Seller of Tenant security deposits held by Seller, Seller 
will deliver, in connection with any such application, written notice to the 
affected Tenant(s) indicating that their security deposits have been or are 
being so applied).

         Section 7.5  Lease Termination Prior to Closing.  The bankruptcy or 
default of any Tenant or the termination of any Lease or New Lease or the 
removal of any Tenant by reason of a default by such Tenant (by summary 
proceedings or otherwise) or by operation of the terms of such Lease or New 
Lease shall not affect the obligations of Buyer under this Agreement in any 
manner or entitle Buyer to a reduction in, or credit or allowance against, 
the Purchase Price or give rise to any other claim on the part of Buyer.

         Section 7.6  Tenant Notices.  At the Closing, Seller shall furnish 
Buyer with a signed notice to be given to each Tenant.  Such notice shall 
disclose that the Property has been sold to Buyer and that, after the 
Closing, all rents should be paid to Buyer.

         Section 7.7  Risk of Loss and Insurance Proceeds.  Buyer shall be 
bound to purchase the  Property for the full Purchase Price as required by 
the terms hereof, without regard to the occurrence or effect of any damage to 
the related Real  Property or destruction of any improvements thereon or 
condemnation of any portion of  the Property, provided that upon the Closing, 
there shall be a credit against the Purchase Price due hereunder equal to the 
amount of 

                                         -25-

<PAGE>

any insurance proceeds or condemnation awards collected by Seller as a result 
of any such damage or destruction or condemnation, plus the amount of any 
insurance deductible or any uninsured amount or retention, less any sums 
reasonably expended by Seller prior to the Closing for the restoration or 
repair of  the Property.  Seller has provided Buyer with a certificate of 
insurance for Seller's casualty insurance policy so that Buyer can confirm 
its satisfaction with such policy.  Seller agree that it will maintain such 
policy in full force and effect until the Closing.  If the proceeds or awards 
have not been collected as of the Closing, then such proceeds or awards shall 
be assigned to Buyer, except to the extent needed to reimburse Seller for 
sums it reasonably expended prior to the Closing for the restoration or 
repair of such Property. Notwithstanding the foregoing, (i) Seller shall not 
settle, compromise or otherwise stipulate any award or recovery in connection 
with any damage, destruction or condemnation, in each case if such damage, 
destruction or condemnation impairs the value of the Property by at least 
$250,000, without the prior written approval of Buyer, which approval shall 
not be unreasonably withheld, (ii) Buyer shall have the right to participate 
in any such settlement or other proceedings, and (iii) if the amount of the 
damage or destruction as described in this Section 7.7 exceeds ten percent 
(10%) of the Purchase Price for the Property, then Buyer may, at its option 
to be exercised within five (5) Business Days of Seller's written notice of 
the occurrence of the damage or destruction, either terminate this Agreement 
or consummate the purchase for the full Purchase Price as required by the 
terms hereof.  If Buyer elects to terminate this Agreement, then the Deposit 
shall be immediately returned to Buyer and neither party shall have any 
further rights or obligations hereunder except to the extent set forth in 
Sections 4.6(a), 6.1, 9.4 and 9.10(a).  If Buyer elects to proceed with the 
purchase, then upon the Closing, Buyer shall be entitled to a credit against 
the Purchase Price and shall receive an assignment of any uncollected 
proceeds or awards, all as set forth in this Section 7.7 above.  The 
provisions of this Section 7.7 shall survive the Closing.

         Section 7.8  Notifications.  Between the Effective Date and the 
Closing, Seller shall promptly notify Buyer of any condemnation, 
environmental, zoning or other land-use regulation proceedings relating to 
the  Property of which Seller obtains actual knowledge by written notice, any 
notices of violations of any legal requirements relating to the  Property 
received by Seller, any litigation of which Seller obtains actual knowledge 
by written notice that arises out of the ownership of the  Property unless 
fully covered by insurance (subject to customary deductibles), and any other 
matters that would materially affect Seller's representations and warranties 
hereunder.

                                         -26-

<PAGE>


                                     ARTICLE VIII

                                  CLOSING AND ESCROW

         Section 8.1  Escrow Instructions.  Upon execution of this Agreement, 
the parties hereto shall deposit an executed counterpart of this Agreement 
with the Title Company, and this instrument shall serve as the instructions 
to the Title Company as the escrow holder for consummation of the purchase 
and sale contemplated hereby.  Seller and Buyer agree to execute such 
reasonable additional and supplementary escrow instructions as may be 
appropriate to enable the Title Company to comply with the terms of this 
Agreement; provided, however, that in the event of any conflict between the 
provisions of this Agreement and any supplementary escrow instructions, the 
terms of this Agreement shall control, unless a contrary intent is expressly 
indicated in such supplementary instructions.

         Section 8.2  Closing. The Closing hereunder shall be held and 
delivery of all items to be made at the Closing under the terms of this 
Agreement shall be made at the offices of Seller's counsel (or such other 
location as the parties may agree) at 10:00 A.M. (Eastern Standard Time) on 
January 5, 1998 or such earlier or later date and time as Buyer and Seller 
may mutually agree upon in writing (the "Closing Date"), in either case, with 
time being of the essence. Except as otherwise permitted under this 
Agreement, such date and time may not be extended without the prior written 
approval of both Seller and Buyer.

         Section 8.3  Deposit of Documents.

         (a)  At or before the December 16, 1997 (the "Document Delivery 
Date"), at the offices of Seller's counsel (or such other time and location 
as the parties may agree) Seller shall deposit into escrow with the Title 
Company the following items (pursuant to escrow instructions reasonably 
acceptable to Seller and Buyer):

              (i)  a duly executed and acknowledged Deed for the Real Property;

              (ii)  [intentionally omitted];

              (iii)  [intentionally omitted]

              (iv)  a duly executed counterpart of a Bill of Sale for the
Property in the form attached hereto as Exhibit E (each, a "Bill of Sale");

              (v)  a duly executed counterpart of an Assignment and Assumption
of Leases for the Property in the form attached hereto as Exhibit F (each, an
"Assignment of Leases");

                                         -27-

<PAGE>

              (vi)  a duly executed counterpart of an Assignment and 
Assumption of Contracts, Warranties and Guaranties and Other Intangible 
Property for each Fee Property and each Leasehold Property in the form 
attached hereto as Exhibit G (each, an "Assignment of Contracts");

              (vii) a duly executed counterpart of an agreement designating 
the Title Company as the "Reporting Person" for the transaction contemplated 
hereby pursuant to Section 6045(e) of the Federal Code and the regulations 
promulgated thereunder, substantially in the form of Exhibit H attached 
hereto (the "Designation Agreement"); 

              (viii)  a duly executed counterpart of such disclosures and 
reports (including withholding certificates) as are required by applicable 
state and local law in connection with the conveyance of the  Property;

              (ix)  the Seller's affidavit to the Title Company, in the form 
of Exhibit L attached hereto (the "Seller's Affidavit"); and

              (x)  an affidavit pursuant to Section 1445(b)(2) of the Code, 
and on which Buyer is entitled to rely, that Seller is not a "foreign person" 
within the meaning of Section 1445(f)(3) of the Code.

         (b)  At or before the Document Delivery Date, at the offices of 
Seller's counsel (or such other time and location as the parties may agree), 
Buyer shall deposit into escrow with the Title Company the following items 
(pursuant to escrow instructions reasonably acceptable to Seller and Buyer):

              (i)  [intentionally omitted];

              (ii)  a duly executed counterpart of each Bill of Sale;

              (iii)  a duly executed counterparts of each Assignment of Leases;

              (iv)  a duly executed counterpart of each Assignment of
Contracts;

              (v)  a duly executed counterpart of the Designation Agreement

              (vi) a duly executed counterpart of Buyer's As-Is Certificate 
and Agreement, substantially in the form of Exhibit I attached hereto; and

              (vii)  a duly executed counterpart of such disclosures and 
reports as are required by applicable state and local law in connection with 
the conveyance of the  Property.

                                         -28-

<PAGE>

         (c)  On the morning of the Closing Date, Buyer shall effect a wire 
transfer of federal funds to the Title Company's escrow account (in 
accordance with the wiring instructions set forth on Schedule 2.2.1) in an 
amount equal to the sum of (i) the Purchase Price and (ii) the amount (if 
any) of the costs, expenses and adjustments payable by Buyer under this 
Agreement.  The amount of the funds to be wired to the Title Company's escrow 
account shall be reduced by the Deposit (including all interest thereon).  
After Seller's  confirmation of receipt of the Purchase Price (as reduced by 
the costs, expenses, prorations and adjustments payable by Seller under this 
Agreement) by wire transfer of federal funds by the Title Company to one or 
more accounts designated by Seller: (i) the Title Company shall be authorized 
to record the Deed for the Real Property, (ii) the Title Company shall 
deliver to Buyer all other documents and instruments received by it which, in 
accordance with the terms of this Agreement, are to be delivered by Seller to 
Buyer on the Closing Date, and (iii) the Title Company shall deliver to Buyer 
all other documents and instruments received by it which, in accordance with 
the terms of this Agreement are to be delivered by Buyer to Seller on the 
Closing Date.  Buyer and Seller shall each deposit such other instruments as 
are reasonably required by the Title Company or otherwise required to close 
the escrow and consummate the purchase and sale of the Property in accordance 
with the terms hereof; provided, that Seller shall not be required to provide 
any indemnities or affidavits or to escrow any funds other than the Seller's 
Affidavit.

         (d)  Seller shall deliver to Buyer originals of the Leases (or, if 
originals are not available, copies), copies of the tenant correspondence 
files of the Real  Property in Seller's possession, a set of keys to  the 
Real Property and originals (or copies, if originals are not available) of 
any other items in Seller's possession relating to the use, ownership, 
operation, maintenance, leasing, repair, alteration, management or 
development of the Real Property, on the Closing Date (at such location as 
Buyer and Seller shall mutually agree).  Following the Closing, Buyer shall 
make all Leases, Contracts, other documents, books, records and any other 
materials in its possession, to the extent the same relate to the period of 
Seller's ownership of the  Property, available to Seller or its 
representatives for inspection and/or copying at Buyer's offices (at Seller's 
sole cost and expense) at reasonable times and upon reasonable notice.

         Section 8.4  Estoppel Certificates.  Seller shall use its reasonable 
efforts (without incurring any additional expense) to obtain prior to the 
Closing Date tenant estoppel certificates from each Tenant substantially in 
the form attached hereto as Exhibit J; provided, however, that if a form of 
estoppel certificate is attached to or otherwise prescribed in a particular 
lease document, that form (the "Prescribed Form") shall be deemed to be 
acceptable to Buyer in the event that any Tenant is unwilling to sign the 
form attached hereto as Exhibit J.  It shall be a condition to Buyer's 
obligation to close the sale and purchase of the Property that on or before 
the Closing Seller delivers to Buyer tenant estoppel certificates 
substantially in the form attached hereto as Exhibit J (or in the Prescribed 
Form, if applicable) from (i) Tenants occupying seventy five percent (75%) of 
the total leased square footage of the  Property; and (ii) Significant 
Tenants occupying seventy five percent (75%) of the total leased square 
footage covered by such 

                                         -29-

<PAGE>

Significant Tenants' Leases (with respect to each of preceding clauses 
(i)-(ii), the "Required Percentage"); provided, however, if Seller is unable 
to obtain the aforesaid tenant estoppel certificates from Tenants or 
Significant Tenants (as the case may be) occupying the Required Percentage, 
Seller may, but shall not be obligated to, provide a certificate to Buyer, 
with respect to such missing estoppel certificates, as chosen by Seller, to 
the effect that (except as disclosed in the Due Diligence Materials or in the 
Leases to which such estoppels relate): (i) to Seller's knowledge the Leases 
for those Tenants or Significant Tenants (as the case may be) are in full 
force and effect; (ii) the amount of the Tenants' or Significant Tenants' 
security deposits; (iii) the dates through which rent has been paid; (iv) 
neither Seller nor, to Seller's knowledge, any of those Tenants or 
Significant Tenants (as the case may be) is in default thereunder;  (v) a 
true, correct and complete copy of the Leases are attached; (vi) the Leases 
expire on the dates specified and are not subject to any renewal or extension 
options, except as specified, and (viii) there are no options to purchase or 
rights of first refusal except as specified.  Buyer shall be obligated to 
accept Seller's certification in lieu of any missing estoppel certificates.  
Seller's representations and warranties in the certificate shall survive the 
Closing, provided that (i)  Buyer must give Seller a Claim Notice with 
respect to any claim it may have against Seller for a breach of any such 
representation and warranty by July 6, 1998, and must commence litigation (if 
any) relating to such Claim Notice not later than October 6, 1998 (and any 
claim that Buyer may have that is not so asserted, or litigation by Buyer 
that is not so commenced, shall be barred and not be valid or effective and 
Seller shall have no liability whatsoever with respect thereto) and (ii) any 
certificate delivered by Seller pursuant to this Section 8.4 shall cease to 
survive the Closing to the extent specifically confirmed by a tenant estoppel 
certificate delivered by a Tenant or a Significant Tenant.  In no event shall 
the minimum thresholds to Buyer's recovery set forth in Section 4.3(a) apply 
to any certificates delivered by Seller (but Buyer's recovery under any such 
certificates shall be limited by the maximum limitations set forth in Section 
4.3(a)).

         Section 8.5  Prorations.

         (a)  Rents, including, without limitation, percentage rents, 
escalation charges for Real Estate Taxes, parking charges, marketing fund 
charges, operating expenses, maintenance escalation rents or charges, 
cost-of-living increases or other charges of a similar nature ("Additional 
Rents"), and any additional charges and expenses payable under Leases; Real 
Estate Taxes and personal property taxes, including refunds with respect 
thereto, if any; the current installment (only) of any improvement bond or 
assessment that is a lien on  the Property or that is pending and may become 
a lien on  the Property; water, sewer and utility charges; amounts payable 
under any existing Contract, Contract entered into after the Effective Date 
and in accordance with this Agreement; annual permits and/or inspection fees 
(calculated on the basis of the period covered); and any other income or 
expenses relating to the operation and maintenance of  the Property (other 
than any Leasing Costs and free rent which shall be prorated as provided in 
Section 7.2), shall all be prorated as of 12:01 a.m. Eastern Standard Time on 
the Closing Date, on the basis of a 365-day year, with Buyer deemed the owner 
of the Properties on the entire 

                                         -30-

<PAGE>

Closing Date.  Rent which is due but uncollected as of the Closing Date shall 
not be adjusted.  On the Closing Date, Seller shall deliver to Buyer a 
schedule of all such past due but uncollected rent owed by tenants.  Buyer 
agrees to cause the amount of such rental arrears to be included in the first 
bills thereafter submitted by Buyer to such tenants after the Closing Date.  
Any rents collected from a tenant after the Closing Date shall be applied 
first to the month in which the Closing Date occurs, next to any rents 
payable by such tenant after the Closing Date and thereafter to any arrearage 
owed by such tenant on the Closing Date in the inverse order of maturity.  
Additional rent payments (and estimated additional rent payments) actually 
paid by tenants prior to Closing attributable to real estate taxes and 
operating costs shall be adjusted as of the Closing Date.  Additional rent 
payments (and estimated additional rent payments) attributable to real estate 
taxes and operating costs to be paid by tenants after the Closing shall be 
adjusted upon receipt by Buyer.  The adjustments of additional rent payments 
shall be based upon the number of days in the period for which such payment 
relates that are before or after the Closing Date.  In no event will Buyer be 
entitled to receive any payments on or under the promissory notes or other 
agreements referred to in Section 8.7. Buyer shall use reasonable efforts 
until October 6, 1998 to collect any delinquent rents that accrued prior to 
the Closing Date (but Seller shall have the right to commence and pursue 
litigation against any Tenant to collect delinquent rents and/or expense 
reimbursements, provided that Seller may not seek as a remedy in any such 
litigation the termination of any Leases or the dispossession of any Tenant). 
 Seller agrees to forward any rents received by it after the Closing Date to 
Buyer for application in accordance with the provisions hereof.  The amount 
of any security deposits that are required to be returned to Tenants under 
Leases shall be credited against the Purchase Price (and Seller shall be 
entitled to retain such security deposits).  In the event the Property has 
been assessed for property taxes purposes at such rates as would result in 
reassessment (i.e., "escape assessment" or "roll-back taxes") based upon the 
change in land usage or ownership of such Property resulting from or after 
the consummation of the transactions described in this Agreement, as between 
Buyer and Seller, Buyer hereby agrees to pay all such taxes and to indemnify 
and save Seller harmless from and against all claims and liability for such 
taxes.  Such indemnity shall survive the Closing.

         (b)  Seller and Buyer hereby agree that if any of the aforesaid 
prorations cannot be calculated accurately on the Closing Date, then the same 
shall be calculated as soon as reasonably practicable after the Closing Date, 
and that if any Tenant is required to pay Additional Rents and such 
Additional Rents are not finally adjusted between the landlord and tenant 
under the applicable Lease until after the end of the 1997 calendar year, 
then such prorations shall be calculated as soon as reasonably practicable 
after such Additional Rents have been finally adjusted.  Either party owing 
the other party a sum of money based on proration(s) calculated after the 
Closing Date shall promptly pay said sum to the other party, together with 
interest thereon at the rate of two percent (2%) per annum over the Prime 
Rate from the Closing Date to the date of payment, if payment is not made 
within ten (10) days after delivery of a bill therefor.  If the real estate 
and/or personal property tax rate and assessments have not been set for the 
calendar year in which the Closing occurs, then the proration of such taxes 
shall be based upon 

                                         -31-

<PAGE>

the rate and assessments for the preceding calendar year, and such proration 
shall be adjusted between Seller and Buyer as soon as reasonably practicable 
after such tax rate or assessment has been set.

         (c)  Buyer shall calculate the prorations contemplated by Section 
8.5(b).  Seller and its representatives and auditors shall be afforded the 
opportunity to review all underlying financial records and work papers 
pertaining to the preparation of Buyer's proration statements, and Buyer 
shall permit Seller and its representatives and auditors during regular 
business hours and upon reasonable prior written notice to have reasonable 
access to the books and records in the possession of Buyer or any party to 
whom Buyer has given custody of the same relating to the  Property to permit 
Seller to review Buyer's proration statements.  Seller shall have sixty (60) 
days after receipt of Buyer's calculations to accept or contest such 
prorations.

         (d)  Buyer shall pay for all recording and escrow fees.  Buyer shall 
also pay the costs of the Title Commitments, Title Policies and all 
endorsements thereto, and Surveys and Survey updates, and all costs of any 
appraisal, engineering and environmental reports not delivered by Seller.  
Buyer shall pay transfer, recordation, excise and deed taxes.  Seller and 
Buyer shall each be responsible for paying their respective attorneys' fees 
and costs.  Buyer and Seller agree that, given the de minimis amount of 
Personal Property included within the  Property, no portion of the Purchase 
Price is allocable or attributable to such Personal Property.

         (e)  Buyer agrees that for purposes of any appeals relating to Real 
Estate Taxes after the Closing Date, Buyer shall not value the  Property in a 
manner (or otherwise take a position) inconsistent with the Purchase Price 
set forth herein.

         (f)  Notwithstanding anything to the contrary herein, to the extent 
set forth in Section 8.6 Seller reserves the right to protest any Real Estate 
Taxes relating to the period prior to the Closing Date and to receive and 
retain any refunds on account of such Real Estate Taxes. 

         (h)  The obligations of Seller and Buyer under this Section 8.5 
shall survive the Closing until October 6, 1998 (except with respect to 
prorations of taxes and municipal assessments).

         Section 8.6  Tax Certiorari Proceedings.  Seller is hereby 
authorized, but not obligated, to (a) commence (prior to the Closing Date) or 
continue (after the Effective Date and after the Closing Date) any proceeding 
for the reduction of the assessed valuation of  the Property for any tax year 
which, in accordance with the laws and regulations applicable to such 
Property, requires that, to preserve the right to bring a tax certiorari 
proceeding with respect to such tax year, such proceeding be commenced prior 
to the Closing Date and (b) endeavor to settle any such proceeding in 
Seller's discretion.  After the Closing, with respect to the Property, (i) 
Seller shall retain all rights (subject to any rights of Tenants under their 
Leases) with respect to any tax 

                                         -32-

<PAGE>

year ending prior to the tax year (and all refunds relating thereto) in which 
the Closing Date occurs, and shall have the sole right to participate in and 
settle any proceeding relating thereto (provided, that such settlement does 
not affect the assessed tax value for any subsequent tax year), and (ii) 
Buyer shall have all rights (subject to any rights of Tenants under their 
Leases) with respect to any tax year (and all refunds relating thereto) which 
ends after the Closing Date; provided, however, that if the proceeding is for 
a tax year in which the Closing Date occurs, such settlement shall not be 
made without Buyer's prior consent, which consent shall not be unreasonably 
withheld or delayed. With respect to any such proceeding for a tax year in 
which the Closing Date occurs (whether commenced by Seller or Buyer), any 
refund or credit of taxes for such tax year shall be applied first to the 
unreimbursed out-of-pocket expenses, including reasonable counsel fees, 
necessarily incurred in obtaining such refund or credit, and second, to any 
Tenant entitled to same, and the balance shall be apportioned between Seller 
and Buyer as of the Closing Date in accordance with the proportion of the 
applicable tax year occurring before and after the Closing Date.  In each 
case, the party which prosecuted the proceeding shall deliver to the other 
copies of receipted tax bills and any decision or settlement agreement 
evidencing the reduction in taxes.  If any refund shall be received by Seller 
which is for the account of Buyer as provided in this Section 8.6, then 
Seller shall hold Buyer's share thereof in trust for Buyer and, promptly upon 
receipt thereof, pay such share to Buyer or any other party entitled to same 
as provided above.  If any refund shall be received by Buyer which is for the 
account of Seller as provided in this Section 8.6, then Buyer shall hold 
Seller's share thereof in trust for Seller and, promptly upon receipt 
thereof, pay such share to Seller or any other party entitled to same as 
provided above.  Each party shall execute any and all consents or other 
documents as may be reasonably necessary to be executed by such party so as 
to permit the other party to commence or continue any tax certiorari 
proceeding which such other party is authorized to commence or continue 
pursuant to the terms of this Section 8.6, or to collect any refund or credit 
with respect to any such tax proceeding.  The provisions of this Section 8.6 
shall survive the Closing.

         Section 8.7  Tenant Obligations.  Notwithstanding anything herein 
that may be construed to the contrary (including, without limitation, Section 
8.5), promissory notes or other agreements (other than the Leases) delivered 
to Seller that evidence, deal with or otherwise relate solely to a Tenant's 
rental or expense reimbursement obligations under its Lease that, as of the 
Closing Date, are or were past due, shall not be conveyed to Buyer and shall 
be retained by Seller.  Seller agrees that in enforcing its rights against 
Tenants under any such promissory notes or other agreements, Seller will not 
seek to exercise any remedies that may be available to it under the affected 
Leases.

         Section 8.8 Seller Financial Statements.  Upon the request of Buyer, 
Seller shall make available to Buyer's third party accountants, Seller's 
audited financial statements for the 1997 calendar year. 

                                         -33-

<PAGE>


                                      ARTICLE IX

                                    MISCELLANEOUS

         Section 9.1  Notices.  Any notices required or permitted to be given 
hereunder shall be given in writing and shall be delivered (a) in person, (b) 
by certified mail, postage prepaid, return receipt requested, (c) by a 
commercial overnight courier that guarantees next day delivery and provides a 
receipt, or (d) by legible facsimile (followed by hard copy delivered in 
accordance with preceding subsections (a)-(c)), and such notices shall be 
addressed as follows:

         To Buyer:      Brandywine Operating Partnership, L.P.
                        16 Campus Blvd., Suite 150
                        Newtown Square, Pennsylvania 19073
                        Attn: Gerard H. Sweeney, President
                        Facsimile No.(610) 325-5622

    with a copy to:     Brad A. Molotsky, Esq., General Counsel
                        c/o Brandywine Realty Trust
                        16 Campus Blvd., Suite 150
                        Newtown Square, Pennsylvania 19073
                        Facsimile No.(610) 325-5622
                   
         To Seller:     Linden Park Limited Partnership
                        c/o GMH Associates, Inc.
                        353 West Lancaster Avenue, Suite 210
                        Wayne, Pennsylvania 19087
                        Attn: Mr. Bruce Robinson
                        Facsimile No. (610) 687-6567

                   
or to such other address as either party may from time to time specify in 
writing to the other party.  Any notice shall be effective only upon receipt 
(or refusal by the intended recipient to accept delivery).  Notices may be 
given by attorneys for the notifying partner.

         Section 9.2  Entire Agreement.  This Agreement, together with the 
Exhibits and Schedules hereto, and the Confidentiality Agreement, contains 
all representations, warranties and covenants made by Buyer and Seller and 
constitutes the entire understanding between the parties hereto with respect 
to the subject matter hereof. Any correspondence, memoranda or agreements 
between the parties, including, without limitation, or any oral or written 
statements made by Seller, its Affiliates, employees or agents, are not 
binding on or enforceable against any party, 

                                         -34-

<PAGE>

and are superseded and replaced in total by this Agreement together with the 
Exhibits and Schedules hereto.

         Section 9.3  Time.  Time is of the essence in the performance of 
each of the parties' respective obligations contained herein.

         Section 9.4  Attorneys' Fees.  If either party hereto fails to 
perform any of its obligations under this Agreement or if any dispute arises 
between the parties hereto concerning the meaning or interpretation of any 
provision of this Agreement, then the defaulting party or the party not 
prevailing in such dispute, as the case may be, shall pay any and all costs 
and expenses incurred by the other party on account of such default and/or in 
enforcing or establishing its rights hereunder, including, without 
limitation, court costs (including costs of any trial or appeal therefrom) 
and reasonable attorneys' fees and disbursements.

         Section 9.5  No Merger.  The obligations contained herein, the 
performance of which is contemplated after the Closing, shall not merge with 
the transfer of title to the  Property but shall remain in effect until 
fulfilled.

         Section 9.6  Assignment.  Buyer's rights and obligations hereunder 
shall not be assignable, directly or indirectly, without the prior written 
consent of Seller; provided, that Buyer may, by written notice delivered to 
Seller not less than ten (10) Business Days prior to the Closing, designate 
any Affiliate of Buyer ("Permitted Assignees") as grantee or assignee, as the 
case may be, of one or more of the  Property and Seller shall convey at 
Closing such Property (on behalf of Buyer) in accordance with such written 
instructions. Nothing contained in the preceding sentence shall be deemed to 
diminish or otherwise affect the obligations of Buyer hereunder, including 
the obligations to pay the Purchase Price at Closing and to indemnify Seller 
and the other Seller Parties in accordance with the terms hereof.  Subject to 
the limitations described herein, this Agreement shall inure to the benefit 
of and be binding upon the parties hereto and their respective successors and 
assigns.

         Section 9.7  Counterparts.  This Agreement may be executed in two or 
more counterparts, each of which shall be deemed an original, but all of 
which taken together shall constitute one and the same instrument.

         Section 9.8  Governing Law; Jurisdiction and Venue.  

              (a)  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN 
ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF PENNSYLVANIA.  THE PARTIES 
RECOGNIZE THAT IT MAY BE NECESSARY FOR THE PARTIES TO COMPLY WITH CERTAIN 
ASPECTS OF THE LAWS OF OTHER STATES IN ORDER TO CONSUMMATE THE PURCHASE AND 
SALE OF SUCH 

                                         -35-

<PAGE>

PROPERTY PURSUANT HERETO.  THE PARTIES AGREE TO COMPLY WITH SUCH OTHER LAWS 
TO THE EXTENT NECESSARY TO CONSUMMATE THE PURCHASE AND SALE OF THE PROPERTY.  
IT IS THE PARTIES' INTENT THAT THE PROVISIONS OF THIS AGREEMENT BE APPLIED TO 
THE PROPERTY IN A MANNER THAT RESULTS IN THE GREATEST CONSISTENCY POSSIBLE.

              (b)  For the purposes of any suit, action or proceeding 
involving this Agreement, Buyer and Seller hereby expressly submit to the 
jurisdiction of all federal and state courts sitting in the Commonwealth of 
Pennsylvania and consent that any order, process, notice of motion or other 
application to or by any such court or a judge thereof may be served within 
or without such court's jurisdiction by registered mail or by personal 
service, provided that a reasonable time for appearance is allowed, and Buyer 
and Seller agree that such courts shall have the exclusive jurisdiction over 
any such suit, action or proceeding commenced by any party.  In furtherance 
of such agreement, Buyer and Seller agree upon the request of the other party 
to discontinue (or agree to the discontinuance of) any such suit, action or 
proceeding pending in any other jurisdiction.

              (c)  Buyer and Seller each hereby irrevocably waive any 
objection that it may now or hereafter have to the laying of venue of any 
suit, action or proceeding arising out of or relating to this Agreement 
brought in any federal or state court sitting in the Commonwealth of 
Pennsylvania and hereby further irrevocably waive any claim that any such 
suit, action or proceeding brought in any such court has been brought in an 
inconvenient forum.

         Section 9.9  Waiver of Trial by Jury.  EACH PARTY HEREBY WAIVES, 
IRREVOCABLY AND UNCONDITIONALLY, TRIAL BY JURY IN ANY ACTION BROUGHT ON, 
UNDER OR BY VIRTUE OF OR RELATING IN ANY WAY TO THIS AGREEMENT OR ANY OF THE 
DOCUMENTS EXECUTED IN CONNECTION HEREWITH, THE  PROPERTY, OR ANY CLAIMS, 
DEFENSES, RIGHTS OF SET-OFF OR OTHER ACTIONS PERTAINING HERETO OR TO ANY OF 
THE FOREGOING.

         Section 9.10  Confidentiality and Return of Documents.  

    (a)  As a condition to Seller's agreement to furnish and/or disclose 
Evaluation Material (as defined below) to Buyer, any Permitted Assignee(s) 
and their Affiliates and representatives for review and inspection, Buyer (on 
behalf of itself, any Permitted Assignee(s), and their respective Affiliates 
and representatives) hereby agrees to be bound by the terms set forth in this 
Section 9.10(a).

           (i)     "Evaluation Material" shall include all documents, and 
    other written or oral information, as well as diskettes and other forms 
    of electronically transmitted data, furnished to Buyer, a Permitted 
    Assignee, or their respective officers, directors, 

                                         -36-

<PAGE>

    employees, agents, advisors, Affiliates or representatives (collectively
    "Representatives") by Seller or its Affiliates relating to the  Property,
    as well as written memoranda, notes, analyses, reports, compilations, or
    studies prepared by Buyer or its Representatives (in whatever form of
    medium) that contain, or are derived from, such information provided by
    Seller.  Notwithstanding the foregoing, information provided by Seller
    shall not constitute "Evaluation Material" if such information (i) is or
    becomes generally available to the public other than as a result of a
    disclosure by or through Buyer or its Representatives in contravention of
    this Section 9.10(a) or (ii) is or becomes available to Buyer from a source
    (other than Seller) not bound, to the knowledge of Buyer, by any legal or
    contractual obligation prohibiting the disclosure of Evaluation Material by
    such source to Buyer.

          (ii)     Buyer agrees that it and its Representatives will use the
    Evaluation Material exclusively for the purpose of evaluating the merits of
    a possible purchase of the  Property as contemplated by this Agreement and
    not for any other purpose whatsoever.  Buyer (on behalf of itself and its
    Representatives) further agrees that it will not disclose any Evaluation
    Material or use it to the detriment of Seller or its Affiliates; provided,
    however, that  Buyer may without liability disclose Evaluation Material
    (x) to any Representative of Buyer who needs to know such Evaluation
    Material for the purpose of evaluating the transactions described in this
    Agreement involving Seller and the  Property and Buyer or its Permitted
    Assignee(s) (it being understood and agreed that Buyer shall be fully
    responsible for any disclosures by any such Person) and (y) pursuant to
    administrative order or as otherwise required by law.

         (iii)     In the event that Buyer desires to disclose Evaluation
    Material under the circumstances contemplated by clause (y) of the
    preceding paragraph, Buyer will (x) provide Seller with prompt notice
    thereof, (y) consult with Seller on the advisability of taking steps to
    resist or narrow such disclosure, and (z) cooperate with Seller (at
    Seller's cost) in any attempt that Seller may make to obtain an order or
    other reliable assurance that confidential treatment will be accorded to
    designated portions of the Evaluation Material.

          (iv)     Buyer agrees that, in the event this Agreement is terminated
    prior to the consummation of the purchase and sale contemplated hereunder,
    all written Evaluation Material and all copies thereof will be returned to
    Seller promptly upon  Seller's request. All analyses, compilations, studies
    or other documents prepared by or for Buyer and reflecting Evaluation
    Material or otherwise based thereon will be (at Buyer's option) either
    (x) destroyed or (y) retained by Buyer in accordance with the
    confidentiality restrictions set forth in this Section 9.10(a).

                                         -37-

<PAGE>


           (v)     Buyer acknowledges that significant portions of the
    Evaluation Material are proprietary in nature and that Seller and its
    Affiliates would suffer significant and irreparable harm in the event of
    the misuse or disclosure of the Evaluation Material.  Without affecting any
    other rights or remedies that either party may have, Buyer acknowledges and
    agrees that  Seller shall be entitled to seek the remedies of injunction,
    specific performance and other equitable relief for any breach, threatened
    breach or anticipatory breach of the provisions of this agreement by Buyer
    or its Representatives.

          (vi)     Buyer agrees to indemnify and hold harmless Seller from and
    against all loss, liability, claim, damage and expense arising out of any
    breach of this Section 9.10(a) by Buyer or any of its Representatives
    (except that Buyer shall not be liable for consequential or punitive
    damages unless such breach was intentional).

         (vii)     This Section 9.10(a) shall survive, if the Closing does not
    occur, any termination of this Agreement, but shall terminate upon the
    Closing.

         (b)  Seller and Buyer hereby covenant that (i) prior to the Closing 
it shall not issue any press release or public statement (a "Release") with 
respect to the transactions contemplated by this Agreement without the prior 
consent of all parties to this Agreement, except to the extent required by 
law or the regulations of the Securities and Exchange Commission or the New 
York Stock Exchange, and (ii) after the Closing, any Release issued by Seller 
or Buyer shall be subject to the review and approval of all such parties 
(which approval shall not be unreasonably withheld).  If Seller or Buyer is 
required by law to issue a Release, such party shall, at least two (2) 
Business Days prior to the issuance of the same, deliver a copy of the 
proposed Release to the other parties for their review.  In response to 
inquiries concerning a Release, Buyer cannot release any information 
concerning Seller without Seller's prior written consent.

         (c)  Seller agrees for a period of one (1) year after the Closing 
Date not to disclose capitalization rates and rates of return relating to the 
Property (the  "Confidential Information"), provided that such disclosure may 
be made (a) to any Person who is a member, partner, officer, director or 
employee of Seller or counsel to or accountants of Seller solely for their 
use and on a need-to-know basis, provided that such Persons are notified of 
Seller's confidentiality obligations hereunder, (b) with the prior consent of 
Buyer, or (c) subject to the next sentence, pursuant to legal, regulatory or 
administrative process.  In the event that Seller shall receive a request to 
disclose any Confidential Information under clause (c) of the preceding 
sentence, Seller shall (i) promptly notify Buyer thereof, (ii) consult with 
Buyer on the advisability of taking steps to resist or narrow such request 
and (iii) if disclosure is required or deemed advisable, reasonably cooperate 
with Buyer (at no cost to Seller) in any attempt it may make to obtain an 
order or other assurance that confidential treatment will be accorded such 
Confidential Information.

                                         -38-

<PAGE>

         Section 9.11  Interpretation of Agreement.  The article, section and 
other headings of this Agreement are for convenience of reference only and 
shall not be construed to affect the meaning of any provision contained 
herein.  Where the context so requires, the use of the singular shall include 
the plural and vice versa and the use of the masculine shall include the 
feminine and the neuter.  The term "person" shall include any individual, 
partnership, joint venture, corporation, trust, limited liability company, 
unincorporated association, any other entity and any government or any 
department or agency thereof, whether acting in an individual, fiduciary or 
other capacity.

         Section 9.12  Amendments.  This Agreement may be amended or modified 
only by a written instrument signed by each of Buyer and Seller.

         Section 9.13  No Recording.  Neither this Agreement nor any 
memorandum or short form thereof may be recorded by Buyer.

         Section 9.14  No Third Party Beneficiary.  The provisions of this 
Agreement are not intended to benefit any third parties.

         Section 9.15  Severability.  If any provision of this Agreement, or 
the application thereof to any person, place or circumstance, shall be held 
by a court of competent jurisdiction to be invalid, unenforceable or void, 
the remainder of this Agreement and such provisions as applied to other 
persons, places and circumstances shall remain in full force and effect.

         Section 9.16  Drafts not an Offer to Enter into a Legally Binding 
Contract.  The parties hereto agree that the submission of a draft of this 
Agreement by one party to another is not intended by either party to be an 
offer to enter into a legally binding contract with respect to the purchase 
and sale of the Property.  The parties shall be legally bound with respect to 
the purchase and sale of the Property pursuant to the terms of this Agreement 
only if and when the parties have been able to negotiate all of the terms and 
provisions of this Agreement in a manner acceptable to each of the parties in 
their respective sole discretion, including, without limitation, all of the 
Exhibits and Schedules hereto, and each of Seller and Buyer have fully 
executed and delivered to each other a counterpart of this Agreement.

         Section 9.17  Further Assurances.  Each party shall, whenever and as 
often as it shall be requested to do so by the other party, execute, 
acknowledge and deliver, or cause to be executed, acknowledged and delivered, 
any and all such other documents and do any and all other acts as may be 
necessary to carry out the intent and purpose of this Agreement.

         Section 9.18  [Intentionally Omitted].

                                         -39-

<PAGE>

         Section 9.19  Exculpation.  No recourse shall be had for any 
obligation under this Agreement , or any document executed and delivered by 
Buyer in connection with the Closing, against any past, present or future 
trustee, shareholder, officer or employee of Brandywine Realty Trust, whether 
by virtue of any statute or rule of law, or by the enforcement of any 
assessment or penalty or otherwise, all such liability being expressly waived 
and released by Seller and all parties claiming by, through or under Seller

         Section 9.20  Counterparts.  This Agreement may be executed in 
counterparts, all of which taken together shall constitute one and the same 
original, and the execution of counterparts by Buyer and Seller shall bind 
Buyer and Seller as if they had executed the same counterpart.



                            [Signatures on following page]




                                         -40-

<PAGE>

         The parties hereto have executed this Agreement as of the date first
written above.


                   Buyer:    BRANDYWINE OPERATING PARTNERSHIP, L.P.

                             By:  Brandywine Realty Trust, General Partner

                             By:  ___________________________
                                  Gerard H. Sweeney
                                  President


                   Seller:   LINDEN PARK LIMITED PARTNERSHIP,
                             A Delaware limited partnership

                             By:  GH Linden, Inc., its general partner


                             By:  _________________________
                                  Name:
                                  Title



                                         -41-
<PAGE>

                                      EXHIBIT N



                                   ESCROW AGREEMENT


    Commonwealth Land Title Insurance Company ("Escrowee") agrees to hold in 
escrow pursuant to this Agreement the sum of $475,000 (the "Deposit") to be 
deposited by Brandywine Operating Partnership, L.P. ("Buyer") pursuant to a 
certain Agreement of Purchase and Sale dated December 15, 1997 ("Agreement"), 
between Buyer and Linden Park Limited Partnership ("Seller"), the provisions 
of which (including, without limitation, the defined terms) are hereby 
incorporated herein by reference.  The Deposit shall be paid to Seller by 
Escrowee at the time of Closing under the Agreement, or if Closing does not 
take place, distributed in accordance with the terms of the Agreement.  
Escrowee shall, immediately upon receipt of the Deposit, deposit same in an 
interest bearing, money market type escrow account with a federally insured 
bank or savings and loan association located in Philadelphia, Pennsylvania.  
All interest which shall accrue on the Deposit shall be paid in accordance 
with the Agreement. Escrowee shall pay such interest to such party 
contemporaneously with Escrowee's payment of the Deposit.  Seller and Buyer 
agree that Escrowee is an escrow holder only and is merely responsible for 
the safekeeping of the Deposit and interest and shall not be required to 
determine questions of fact or law.  If Escrowee shall receive notice of a 
dispute as to the disposition of the Deposit or the interest, then Escrowee 
shall not distribute the Deposit or interest except in accordance with 
written instructions signed by both Buyer and Seller. Pending resolution of 
any such dispute,  Escrowee is authorized to pay the Deposit and interest 
into court.  If Escrowee pays the Deposit and interest into court, it shall 
be discharged from all further obligations hereunder.  This Escrow Agreement 
shall be governed by the laws of the state of New York.

         Seller's Federal Tax ID Number is 51-0369712.

         Buyer's Federal Tax ID Number is 23-2862640.



<PAGE>

    IN WITNESS WHEREOF, Buyer, Seller and Escrowee, for valuable 
consideration, each intending to be legally bound and to bind their 
respective successors and assigns, have caused this Escrow Agreement to be 
executed and delivered as of _______________.

                   Escrowee: COMMONWEALTH LAND TITLE INSURANCE COMPANY





                             By:  ___________________________
                                  Name:
                                  Title:


                   Buyer:    BRANDYWINE OPERATING PARTNERSHIP, L.P.

                             By:  Brandywine Realty Trust, General Partner

                             By:  ___________________________
                                  Gerard H. Sweeney
                                  President


                   Seller:   LINDEN PARK LIMITED PARTNERSHIP,
                             A Delaware limited partnership

                             By:  GH Linden, its general partner


                             By:  _________________________
                                  Name:
                                  Title

