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SUBSEQUENT EVENTS (Details) |  |  |  | 1 Months Ended | 12 Months Ended | 113 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2017 USD ($) | Jan. 07, 2016 | Jul. 31, 2014 | Feb. 28, 2014 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2016 USD ($) $ / item shares | Mar. 10, 2015 shares | Aug. 20, 2007 shares
Subsequent events |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  |  |  | 1,364,757 |  |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  |  |  |  |  |  | 27.12 |  |
Payment on line of credit |  |  |  |  | $ 25,000,000 |  |  |  |  |
Notes Payable |  |  |  |  |  | $ 25,000,000 |  |  |  |
Repurchase of units | shares |  |  |  |  | 965 | 2,279 | 1,834 |  |  |
Total cost of repurchase |  |  |  |  | $ 1,634,945 | $ 3,429,953 | $ 2,685,583 | $ 40,231,000 |  |
Depository receipts authorized to be repurchased | shares |  |  |  |  |  |  |  |  | 2,000,000 | 300,000
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts | LIBOR |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.01% |  |  |  |  |  |  |  |
Mortgages payable | Linhart L.P. Residential/Commercial Newton, Massachusetts |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  | $ 1,926,000 |  |  |  |  |  |
Mortgages payable | Hamilton Linewt LLC Commercial-1031 Exchange Newton, Massachusetts |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  | $ 1,466,000 |  |  |  |  |  |
Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Debt Instrument Description of Variable Rate Basis Used for Calculation of Base Rate |  |  | one month LIBOR |  |  |  |  |  |  |
Subsequent event | Hamilton Bay Apts |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off | $ 4,444,918 |  |  |  |  |  |  |  |  |
Capital contributions | $ 2,222,000 |  |  |  |  |  |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  |  |  | 162 |  |
Total cost of repurchase |  |  |  |  | 16,181 | 33,878 | 26,363 |  |  |
Class B |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  |  |  | 3,068 |  |
Total cost of repurchase |  |  |  |  | $ 307,436 | $ 643,682 | $ 500,888 |  |  |

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