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MORTGAGE NOTES PAYABLE (Details) - 10Q (USD $) | 9 Months Ended | 85 Months Ended | 0 Months Ended |  |  | 0 Months Ended | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 1 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 1 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Jul. 31, 2014 Line of Credit [Member] | Sep. 30, 2014 Line of Credit [Member] | Jul. 31, 2014 Line of Credit [Member] item | Jul. 31, 2014 Base Rate [Member] Line of Credit [Member] | Jul. 31, 2014 Prime Rate [Member] Line of Credit [Member] | Jul. 31, 2014 Federal Funds Rate [Member] Line of Credit [Member] | Jul. 31, 2014 London Interbank Offered Rate (LIBOR) [Member] Line of Credit [Member] | Jul. 15, 2013 Hamilton Green | Jul. 31, 2014 Minimum Line of Credit [Member] | Jul. 31, 2014 Minimum Base Rate [Member] Line of Credit [Member] | Jul. 31, 2014 Maximum Line of Credit [Member] | Jul. 31, 2014 Maximum Base Rate [Member] Line of Credit [Member] | Sep. 30, 2014 Mortgages payable | Dec. 20, 2013 Mortgages payable Hamilton Green | Dec. 20, 2013 Mortgages payable Hamilton Green | Jun. 11, 2014 Mortgages payable NERA Dean Street Associates, LLC | Jun. 11, 2014 Mortgages payable NERA Dean Street Associates, LLC | Oct. 01, 2013 Mortgages payable Westgate Apartments LLC | Oct. 01, 2013 Mortgages payable Westgate Apartments LLC | Jul. 11, 2014 Mortgages payable Westgate Apartments Burlington LLC [Member] | Jul. 11, 2014 Mortgages payable Westgate Apartments Burlington LLC [Member] | Feb. 25, 2013 Mortgages payable Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts | Feb. 28, 2014 Mortgages payable Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts | Mar. 11, 2013 Mortgages payable Property located at School Street | Mar. 11, 2013 Mortgages payable Property located at School Street | Jul. 07, 2013 Mortgages payable Boylston Downtown L.P. Residential Apartments Boston, Massachusetts | Jul. 07, 2013 Mortgages payable Boylston Downtown L.P. Residential Apartments Boston, Massachusetts | Feb. 28, 2014 Mortgages payable Hamilton Linewt LLC Commercial-1031Exchange Newton, Massachusetts | Feb. 28, 2014 Mortgages payable Linhart L.P. Residential/Commercial Newton, Massachusetts | Sep. 30, 2014 Mortgages payable Minimum | Sep. 30, 2014 Mortgages payable Maximum
MORTGAGE NOTES PAYABLE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.67% |  | 4.22% |  | 4.65% |  | 4.31% |  |  |  | 3.70% |  | 3.97% |  |  | 3.76% | 5.97%
Amount of monthly installments including principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 808,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.81% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) | 5.46% |  | 5.46% |  |  |  |  |  |  |  |  |  |  |  |  | 4.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual maturities of mortgage debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015-current maturities | 133,000 |  | 133,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 726,000 |  | 726,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 1,821,000 |  | 1,821,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 7,840,000 |  | 7,840,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 | 1,912,000 |  | 1,912,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 183,671,000 |  | 183,671,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 196,103,000 |  | 196,103,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months | 133,000 |  | 133,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  | 3,967,000 |  |  |  |  |  | 1,466,000 | 1,926,000 |  |
Mortgage prepayment penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Amount of new loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,500,000 |  | 5,687,000 |  | 15,700,000 |  |  |  |  |  | 15,000,000 |  | 40,000,000 |  |  |  |  |
Period of interest only payments on loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  | 10 years |  | 10 years |  | 10 years |  |  |  | 3 years |  |  |  |  |  |  |
Term of debt |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Amortization period of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  | 30 years |  | 30 years |  |  |  |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,846,000 |  | 5,077,000 |  | 7,616,000 |  | 2,010,000 |  |  |  | 15,284,000 |  | 19,500,000 |  |  |  |
Deferred financing cost associated with mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 159,000 |  |  |  |  |  |
Net proceed from the loan - cash back |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |
Refinancing cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 346,000 |  | 89,000 |  | 190,000 |  |  |  |  |  |  |  | 279,000 |  |  |  |  |
Closing costs associated with financing |  |  |  |  |  |  |  |  |  |  | 38,000 |  |  |  |  |  | 346,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of new loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,500,000 |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Repurchase of depository receipts | 25,920 |  | 1,268,811 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price of depository receipts | $ 47.22 |  | $ 25.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price of units | $ 1,416.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of depository receipts | 1,258,399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of units | 1,080 | 905 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cost of repurchase | 1,564,397 | 1,021,987 | 34,045,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of refinancing costs |  |  |  |  |  | 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |
Maximum borrowings |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate used in calculation of Base Rate |  |  |  |  |  |  | base | Prime | Federal Funds | one month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  |  |  |  |  |  |  | 0.50% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds drawn by the company |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged interests rate of the Partnership's ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties in which borrowing amount collateralized |  |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the percentage points added to the reference rate to compute the variable rate which is used in calculation of base rate on the debt instrument. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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