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RELATED PARTY TRANSACTIONS (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 item | Sep. 30, 2011 | Dec. 31, 2011 | Sep. 30, 2012 Limited Partnerships Minimum | Sep. 30, 2012 Limited Partnerships Maximum | Sep. 30, 2012 Partially Owned Properties [Member] | Sep. 30, 2012 Wholly Owned Properties [Member] | Dec. 31, 2011 Wholly Owned Properties [Member] | Sep. 30, 2012 General Partner or Management Company | Sep. 30, 2011 General Partner or Management Company | Sep. 30, 2012 General Partner or Management Company Minimum | Sep. 30, 2012 General Partner or Management Company Partially Owned Properties [Member] Limited Partnerships Minimum 62 Boylston Street | Sep. 30, 2012 Management Company item | Sep. 30, 2011 Management Company | Sep. 30, 2012 Hamilton Company | Sep. 30, 2012 Dexter Park | Sep. 30, 2011 President of Management Company | Sep. 30, 2012 Harold Brown Minimum | Sep. 30, 2012 Harold Brown Maximum | Apr. 30, 2012 HBC | Feb. 29, 2012 HBC | Dec. 31, 2011 HBC | Oct. 31, 2011 HBC | Aug. 31, 2011 HBC | Aug. 31, 2010 HBC | Oct. 31, 2009 HBC | Dec. 31, 2010 HBC | Sep. 30, 2012 HBC | Sep. 30, 2011 HBC | Oct. 28, 2009 HBC
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee as a percentage of rental revenue |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee as percentage of Linewt |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees of related party |  |  | $ 1,078,000 | $ 1,047,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs related to professional services |  |  |  |  |  |  |  |  |  |  | 503,000 | 601,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repairs and maintenance | 1,487,272 | 1,421,084 | 3,857,918 | 3,800,836 |  |  |  |  |  |  | 216,000 |  |  |  |  |  | 53,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative expense | 463,687 | 411,836 | 1,362,276 | 1,237,424 |  |  |  |  |  |  | 242,000 |  |  |  |  |  | 62,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses for construction, architectural services and supervision of capital projects |  |  |  |  |  |  |  |  |  |  | 22,000 |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental commissions |  |  |  |  |  |  |  |  |  |  | 23,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 552,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee | 360,578 | 347,833 | 1,078,188 | 1,032,069 |  |  |  |  |  |  |  |  |  |  |  |  | 423,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement to related party for payroll transfers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,999,000 | 1,923,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of accounting staff of related party providing bookkeeping and accounting functions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees for accounting and bookkeeping services |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,750 | 93,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee for asset management consulting services |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,250 |  |  |  |  | 56,250 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited partnerships and limited liability companies in which the entity has invested |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  | 40.00% | 50.00% |  |  |  |  |  | 40.00% |  |  |  |  |  |  | 43.20% | 57.00% |  |  |  |  |  |  |  |  |  |  |
Number of employees having ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,168,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00%
Term of mortgage loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Notice period demanding early payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Principal paydown of debt upon notice |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |
Repayment of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 918,600 |  |  |  |  |  |  | 2,500,000 |  |  |
Amount of principal payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000 | 1,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |  |
Outstanding amount of mortgage loan | 138,335,670 |  | 138,335,670 |  | 139,161,612 |  |  | 138,735,174 | 138,335,689 | 139,161,612 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,668,600 |  |  |  |  |  |  |  |
Interest paid |  |  | $ 5,854,000 | $ 6,008,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,960 | $ 202,000 |

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