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SUBSEQUENT EVENTS (Details) (USD $) | 3 Months Ended | 12 Months Ended | 64 Months Ended |  | 0 Months Ended | 12 Months Ended | 64 Months Ended |  | 0 Months Ended | 12 Months Ended | 64 Months Ended |  | 3 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended
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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, 2012 | Dec. 31, 2009 | Sep. 17, 2008 Class B | Dec. 31, 2012 Class B | Dec. 31, 2011 Class B | Dec. 31, 2010 Class B | Dec. 31, 2012 Class B | Dec. 31, 2009 Class B | Sep. 17, 2008 General Partnership units | Dec. 31, 2012 General Partnership units | Dec. 31, 2011 General Partnership units | Dec. 31, 2010 General Partnership units | Dec. 31, 2012 General Partnership units | Dec. 31, 2009 General Partnership units | Mar. 31, 2013 Subsequent event | Feb. 04, 2013 Subsequent event | Dec. 31, 2012 Subsequent event 32 unit Nashoba Apartments LP in Acton, Massachusetts | Dec. 31, 2011 Subsequent event 32 unit Nashoba Apartments LP in Acton, Massachusetts | Dec. 31, 2010 Subsequent event 32 unit Nashoba Apartments LP in Acton, Massachusetts | Mar. 31, 2013 Subsequent event Class B | Mar. 31, 2013 Subsequent event General Partnership units | Dec. 31, 2012 Pro Forma
SUBSEQUENT EVENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of depository receipts (in shares) |  |  |  |  |  |  |  |  | 24,967 |  | 20,688 | 1,219,927 |  |  |  |  | 164 | 1,921 |  |  | 10 |  | 9 | 101 |  | 9,709 |  |  |  |  |  |  |
Repurchase price of depository receipts (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 24.62 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.24 |  |  |  |  |  |  |
Repurchase price of units (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 613.94 |  |  |  |  |  | $ 613.94 |  | $ 967.20 |  |  |  |  | $ 967.20 | $ 967.20 |
Repurchase of units |  |  |  |  |  |  |  |  | $ 906,214 |  | $ 540,911 | $ 31,386,000 |  |  | $ 171,148 |  | $ 102,591 |  |  |  | $ 9,008 |  | $ 5,400 |  |  | $ 321,240 |  |  |  |  | $ 74,335 | $ 3,912 |
Repurchase of units (in shares) |  |  |  |  |  |  |  |  | (1,040) |  | (862) |  |  | 6,309 | 198 |  |  |  |  | 333 |  |  |  |  |  |  |  |  |  |  | 76.86 | 4.05 |
Distribution per unit (in dollars per unit) | $ 30.00 |  |  |  | $ 28.00 |  |  |  | $ 30.00 | $ 28.00 | $ 28.00 | $ 30.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.50 |  |  |  |  |  |
Distributions per Depositary Receipt (in dollars per share) | $ 1.00 |  |  |  | $ 0.93 |  |  |  | $ 1.00 | $ 0.93 | $ 0.93 | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.25 |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental Properties | 95,435,850 |  |  |  | 98,924,534 |  |  |  | 95,435,850 | 98,924,534 |  | 95,435,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,283,000 | 1,210,000 |  |  |  | 95,435,850
Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 821,000 | 743,000 |  |  |  |
Rental property (net) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 462,000 | 467,000 |  |  |  |
Other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 123,000 | 80,000 |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | 6,000 |  |  |  |
Total Assets | 121,538,490 |  |  |  | 125,376,764 |  |  |  | 121,538,490 | 125,376,764 |  | 121,538,490 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 587,000 | 553,000 |  |  |  | 146,478,378
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable | 138,055,522 |  |  |  | 139,161,612 |  |  |  | 138,055,522 | 139,161,612 |  | 138,055,522 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  | 163,035,536
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,000 | 70,000 |  |  |  |
Total Liabilities | 144,054,168 |  |  |  | 146,687,616 |  |  |  | 144,054,168 | 146,687,616 |  | 144,054,168 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,071,000 | 2,070,000 |  |  |  | 169,034,182
Partner's equity | (22,515,677) |  |  |  | (21,310,851) |  |  |  | (22,515,677) | (21,310,851) | (26,920,566) | (22,515,677) | (21,332,823) |  | (4,273,666) | (4,045,782) | (5,111,627) | (4,273,666) | (4,050,138) |  | (224,929) | (212,935) | (269,033) | (224,929) | (213,165) |  |  | (1,484,000) | (1,517,000) |  |  |  | (22,555,804)
Total Liabilities and Partners' Capital | 121,538,490 |  |  |  | 125,376,764 |  |  |  | 121,538,490 | 125,376,764 |  | 121,538,490 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 587,000 | 553,000 |  |  |  | 146,478,378
Statements of Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other Income |  |  |  |  |  |  |  |  | 35,244,008 | 33,608,799 | 31,816,175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 462,000 | 451,000 | 450,000 |  |  | 35,244,008
Operating Expenses |  |  |  |  |  |  |  |  | 3,633,619 | 4,080,647 | 3,784,401 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 241,000 | 260,000 | 261,000 |  |  | 3,633,619
Interest expense |  |  |  |  |  |  |  |  | (7,802,999) | (7,965,422) | (8,053,628) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,000 | 108,000 | 108,000 |  |  | (7,730,177)
Depreciation |  |  |  |  |  |  |  |  | 6,092,725 | 5,910,746 | 5,531,509 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 | 72,000 | 63,000 |  |  | 6,205,673
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 429,000 | 440,000 | 432,000 |  |  | 22,823,292
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) |  |  |  | 690,422 | 1,765,343 | (258,254) |  |  |  | 36,338 | 92,913 | (13,592) |  |  |  |  | 33,000 | 11,000 | 18,000 |  |  | 3,593,672
Cash Flow Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from (to) Nashoba |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 | $ (72,000) | $ 45,000 |  |  |

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