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SUBSEQUENT EVENTS (Details) (USD $) | 6 Months Ended | 70 Months Ended |  |  |  |  | 6 Months Ended | 70 Months Ended | 3 Months Ended | 6 Months Ended | 70 Months Ended | 3 Months Ended | 6 Months Ended | 70 Months Ended | 1 Months Ended |  | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Hamilton Bay Unit Sales item | Jun. 30, 2012 Hamilton Bay Unit Sales item | Apr. 30, 2008 Hamilton Bay Unit Sales item | Jun. 30, 2013 Class A units | Jun. 30, 2012 Class A units | Jun. 30, 2013 Class A units | Jun. 30, 2013 Class B Units | Jun. 30, 2013 Class B Units | Jun. 30, 2012 Class B Units | Jun. 30, 2013 Class B Units | Jun. 30, 2013 General Partnership units | Jun. 30, 2013 General Partnership units | Jun. 30, 2012 General Partnership units | Jun. 30, 2013 General Partnership units | Apr. 30, 2008 Mortgage Hamilton Bay Unit Sales | Jun. 30, 2013 Mortgage Hamilton Bay Unit Sales | Aug. 09, 2013 Subsequent events | Aug. 09, 2013 Subsequent events | Aug. 09, 2013 Subsequent events Class A units | Aug. 09, 2013 Subsequent events Class A units | Aug. 09, 2013 Subsequent events Class B Units | Aug. 09, 2013 Subsequent events Class B Units | Aug. 09, 2013 Subsequent events General Partnership units | Aug. 09, 2013 Subsequent events General Partnership units | Aug. 01, 2013 Subsequent events Mortgage Hamilton Bay Unit Sales | Jul. 07, 2013 Subsequent events Boylston Downtown LP Mortgage | Jul. 15, 2013 Subsequent events Hamilton Green Apartments, LLC item | Jul. 15, 2013 Subsequent events Hamilton Green Apartments, LLC Mortgage
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of new loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,368,000 |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  | 3.97% |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Amortization period of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,500,000 |  |
Outstanding amount of mortgage loan | 131,671,632 |  | 131,671,632 | 138,055,522 | 1,668,000 | 1,668,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,668,000 |  |  |  |  |  |  |  |  | 1,318,000 | 20,000,000 |  |
Number of units |  |  |  |  | 120 | 120 | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 193 |
Purchase price of real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,500,000 |
Short term finance for real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |
Use of funds for real estate properties from exchange of apartments and cash reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |
Basis of interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR
Notional margin over basis of interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25%
Current interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.45%
Repayment of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000 |  |  |
Contribution required to repay the debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Repurchase of depository receipts (in shares) |  |  | 1,229,636 |  |  |  |  | 9,709 |  | 1,229,636 | 0 | 77 |  | 1,998 | 0 | 4 |  | 105 |  |  | 12,000 | 12,000 |  |  |  |  |  |  |  |  |  |
Repurchase price of depository receipts (in dollars per share) |  |  | $ 24.68 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41.50 | $ 41.50 |  |  |  |  |  |  |  |  |  |
Repurchase price of units (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 740.40 |  |  |  | $ 627.53 |  |  |  | $ 627.53 |  |  |  |  | $ 1,245.00 | $ 1,245.00 | $ 95 | $ 95 | $ 5 | $ 5 |  |  |  |
Total cost of repurchase | $ 399,487 | $ 69,379 | $ 31,786,000 |  |  |  |  | $ 321,240 | $ 55,778 |  |  | $ 74,335 | $ 12,921 |  |  | $ 3,912 | $ 680 |  |  |  | $ 498,000 | $ 498,000 |  |  | $ 118,275 | $ 118,275 | $ 6,225 | $ 6,225 |  |  |  |

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