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SUBSEQUENT EVENTS (Details 2) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Historical | Dec. 31, 2012 Subsequent event item | Feb. 25, 2013 Subsequent event Mortgage Notes Payable Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts | Mar. 11, 2013 Subsequent event Mortgage Notes Payable Property located at School Street | Mar. 11, 2013 Subsequent event Mortgage Notes Payable Boylston Downtown LP and Westgate Apartments LLC | Mar. 22, 2013 Subsequent event Mortgage Notes Payable Boylston Downtown | Mar. 22, 2013 Subsequent event Mortgage Notes Payable Westgate Apartments LLC | Dec. 31, 2012 Pro Forma | Dec. 31, 2012 Pro Forma Adjustments Refinancing
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,697,000 |  |  |  |  |  |
Amount of new loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  |  |  |  |
Period of interest on loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Deferred financing cost associated with mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 159,000 |  |  |  |  |
Total amount expected to be refinanced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 | 19,500,000 | 7,932,000 |  |
Additional debt that entity can borrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |  |  |
Change in mortgage debt related to number of mortgaged properties |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Expected amount of new loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 | 17,000,000 |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental Properties | 95,435,850 |  |  |  | 98,924,534 |  |  |  | 95,435,850 | 98,924,534 |  |  | 95,435,850 |  |  |  |  |  |  | 95,435,850 |
Cash and Cash Equivalents | 6,981,906 |  |  |  | 4,050,157 |  |  |  | 6,981,906 | 4,050,157 | 3,245,361 | 2,879,663 | 6,981,906 |  |  |  |  |  |  | 28,447,599 | 21,465,693
Rents Receivable | 475,083 |  |  |  | 434,252 |  |  |  | 475,083 | 434,252 |  |  | 475,083 |  |  |  |  |  |  | 475,083 |
Real Estate Tax Escrows | 449,652 |  |  |  | 401,325 |  |  |  | 449,652 | 401,325 |  |  | 449,652 |  |  |  |  |  |  | 449,652 |
Prepaid Expenses and Other Assets | 3,073,890 |  |  |  | 3,866,652 |  |  |  | 3,073,890 | 3,866,652 |  |  | 3,073,890 |  |  |  |  |  |  | 5,102,290 | 2,028,400
Investments in Unconsolidated Joint Ventures | 13,986,173 |  |  |  | 16,780,657 |  |  |  | 13,986,173 | 16,780,657 |  |  | 13,986,173 |  |  |  |  |  |  | 13,986,173 |
Financing and Leasing Fees | 1,135,936 |  |  |  | 919,187 |  |  |  | 1,135,936 | 919,187 |  |  | 1,135,936 |  |  |  |  |  |  | 2,581,731 | 1,445,795
Total Assets | 121,538,490 |  |  |  | 125,376,764 |  |  |  | 121,538,490 | 125,376,764 |  |  | 121,538,490 |  |  |  |  |  |  | 146,478,378 | 24,939,888
LIABILITIES AND PARTNERS' CAPITAL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | 138,055,522 |  |  |  | 139,161,612 |  |  |  | 138,055,522 | 139,161,612 |  |  | 138,055,522 |  |  |  |  |  |  | 163,035,536 | 24,980,014
Accounts Payable and Accrued Expenses | 2,361,942 |  |  |  | 2,253,696 |  |  |  | 2,361,942 | 2,253,696 |  |  | 2,361,942 |  |  |  |  |  |  | 2,361,942 |
Advance Rental Payments and Security Deposits | 3,636,704 |  |  |  | 3,603,708 |  |  |  | 3,636,704 | 3,603,708 |  |  | 3,636,704 |  |  |  |  |  |  | 3,636,704 |
Total Liabilities | 144,054,168 |  |  |  | 146,687,616 |  |  |  | 144,054,168 | 146,687,616 |  |  | 144,054,168 |  |  |  |  |  |  | 169,034,182 | 24,980,014
Partners' Capital 130,444 units outstanding in 2012 | (22,515,677) |  |  |  | (21,310,851) |  |  |  | (22,515,677) | (21,310,851) | (26,920,566) | (21,332,823) | (22,515,678) |  |  |  |  |  |  | (22,555,804) | (40,126)
Total Liabilities and Partners' Capital | 121,538,490 |  |  |  | 125,376,764 |  |  |  | 121,538,490 | 125,376,764 |  |  | 121,538,490 |  |  |  |  |  |  | 146,478,378 | 24,939,888
Partners' Capital, units outstanding | 130,444 |  |  |  | 131,484 |  |  |  | 130,444 | 131,484 | 131,484 | 132,346 |  |  |  |  |  |  |  | 130,444 |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 35,244,008 | 33,608,799 | 31,816,175 |  | 35,244,008 |  |  |  |  |  |  | 35,244,008 |
Laundry and sundry income |  |  |  |  |  |  |  |  | 388,401 | 426,803 | 439,782 |  | 388,401 |  |  |  |  |  |  | 388,401 |
Total Revenues | 9,104,015 | 8,875,596 | 8,800,416 | 8,852,382 | 8,760,538 | 8,648,526 | 8,345,643 | 8,280,894 | 35,632,409 | 34,035,602 | 32,255,957 |  | 35,632,409 |  |  |  |  |  |  | 35,632,409 |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative |  |  |  |  |  |  |  |  | 1,825,951 | 1,707,408 | 1,772,599 |  | 1,825,951 |  |  |  |  |  |  | 1,825,951 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,092,725 | 5,910,746 | 5,531,509 |  | 6,092,725 |  |  |  |  |  |  | 6,205,673 | 112,948
Management fee |  |  |  |  |  |  |  |  | 1,446,620 | 1,404,467 | 1,330,157 |  | 1,446,620 |  |  |  |  |  |  | 1,446,620 |
Operating |  |  |  |  |  |  |  |  | 3,633,619 | 4,080,647 | 3,784,401 |  | 3,633,619 |  |  |  |  |  |  | 3,633,619 |
Renting |  |  |  |  |  |  |  |  | 183,529 | 365,110 | 528,686 |  | 183,529 |  |  |  |  |  |  | 183,529 |
Repairs and maintenance |  |  |  |  |  |  |  |  | 5,179,408 | 5,056,054 | 4,886,724 |  | 5,179,408 |  |  |  |  |  |  | 5,179,408 |
Taxes and insurance |  |  |  |  |  |  |  |  | 4,348,492 | 4,146,554 | 4,082,588 |  | 4,348,492 |  |  |  |  |  |  | 4,348,492 |
Total Expenses | 5,704,596 | 5,730,319 | 5,413,735 | 5,861,694 | 5,722,971 | 5,665,232 | 5,508,842 | 5,773,941 | 22,710,344 | 22,670,986 | 21,916,664 |  | 22,710,344 |  |  |  |  |  |  | 22,823,292 | 112,948
Income Before Other Income and Discontinued Operations | 3,399,419 | 3,145,277 | 3,386,681 | 2,990,688 | 3,037,567 | 2,983,294 | 2,836,801 | 2,506,953 | 12,922,065 | 11,364,616 | 10,339,293 |  | 12,922,065 |  |  |  |  |  |  | 12,809,117 | (112,948)
Other Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 2,216 | 3,861 | 5,932 |  | 2,216 |  |  |  |  |  |  | 2,216 |
Interest expense |  |  |  |  |  |  |  |  | (7,802,999) | (7,965,422) | (8,053,628) |  | (7,802,999) |  |  |  |  |  |  | (7,730,177) | 72,822
(Loss) from investments in unconsolidated joint ventures |  |  |  |  |  |  |  |  | (1,487,484) | (1,913,800) | (3,869,996) |  | (1,487,484) |  |  |  |  |  |  | (1,487,484) |
Other (loss) |  |  |  |  |  |  |  |  |  |  | (700) |  |  |  |  |  |  |  |  |  |
Total Other Income (Expense) | (2,214,288) | (2,370,824) | (2,339,420) | (2,363,735) | (2,469,002) | (2,523,314) | (2,480,305) | (2,402,740) | (9,288,267) | (9,875,361) | (11,918,392) |  | (9,288,267) |  |  |  |  |  |  | (9,215,445) | 72,822
Income (loss) from Continuing Operations |  |  |  |  |  |  |  |  | 3,633,798 | 1,489,255 | (1,579,099) |  | 3,633,798 |  |  |  |  |  |  | 3,593,672 | (40,126)
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 81,567 | 219,867 |  |  |  |  |  |  |  |  |  |
(Gain) on sale of real estate from discontinued operations |  |  |  |  |  |  |  |  |  | (7,720,459) |  |  |  |  |  |  |  |  |  |  |
Total Discontinued Operations |  |  |  |  | (308) | (3,054) | 7,736,789 | 68,599 |  | 7,802,026 | 219,867 |  |  |  |  |  |  |  |  |  |
Net Income (loss) | $ 1,185,131 | $ 774,453 | $ 1,047,261 | $ 626,953 | $ 568,257 | $ 456,926 | $ 8,093,285 | $ 172,812 | $ 3,633,798 | $ 9,291,281 | $ (1,359,232) |  | $ 3,633,798 |  |  |  |  |  |  | $ 3,593,672 | $ (40,126)
Income (loss) per Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before discontinued operations (in dollars per unit) | $ 9.07 | $ 5.90 | $ 7.97 | $ 4.77 | $ 4.33 | $ 3.50 | $ 2.71 | $ 0.79 | $ 27.69 | $ 11.33 | $ (11.99) |  | $ 27.69 |  |  |  |  |  |  | $ 27.38 | $ (0.31)
Income from discontinued operations (in dollars per unit) |  |  |  |  |  | $ (0.02) | $ 58.84 | $ 0.52 |  | $ 59.34 | $ 1.67 |  |  |  |  |  |  |  |  |  |
Net Income per Unit (in dollars per unit) | $ 9.07 | $ 5.90 | $ 7.97 | $ 4.77 | $ 4.33 | $ 3.48 | $ 61.55 | $ 1.31 | $ 27.69 | $ 70.67 | $ (10.32) |  | $ 27.69 |  |  |  |  |  |  | $ 27.38 | $ (0.30)
Weighted Average Number of Units Outstanding (in units) |  |  |  |  |  |  |  |  | 131,230 | 131,484 | 131,696 |  | 131,230 |  |  |  |  |  |  | 131,230 | 131,230

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