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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Hamilton Minuteman) (Details) |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 12, 2016 USD ($) | Jan. 31, 2007 USD ($) | Oct. 31, 2004 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2006 USD ($) | Sep. 30, 2004 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  | $ 2,298,588 | $ 9,029,233 | $ 7,212,044 |  |
Number of units | item |  |  |  |  | 1,033 |  |  |
Distribution to the Partnership |  |  |  | 2,238,962 | $ 2,239,168 |  |  |
Outstanding amount of mortgage |  |  |  | 253,185,372 |  | $ 233,221,258 |  |
Hamilton Minuteman |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  | $ 20,716 |  |  | $ 5,075,000
Ownership interest (as a percent) |  |  |  |  | 50.00% |  |  | 50.00%
Number of units | item |  |  |  |  | 42 |  |  | 42
Cash contribution by the entity towards loan |  |  |  |  |  |  | $ 1,250,000 |
Outstanding amount of mortgage |  |  |  | $ 6,000,000 |  |  |  |
Purchase price of investments |  |  |  |  |  |  |  | $ 10,100,000
Amount returned to partnership |  |  | $ 3,775,000 |  |  |  |  |
Residential buildings |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  | 1,030 |  |  |
Residential buildings | Hamilton Minuteman |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  | 42 |  |  |
Mortgages payable | Hamilton Minuteman |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |
Distribution to the Partnership | $ 385,000 |  |  |  |  |  |  |
Mortgage amount | 6,000,000 |  |  |  |  |  |  |
Term of debt |  | 10 years |  |  |  |  |  |
Amount of mortgage paid off | 5,158,000 |  |  |  |  |  |  |
Refinancing costs | $ 123,000 |  |  |  |  |  |  |
Interest rate (as a percent) | 3.71% | 5.67% |  |  |  |  |  |
Period for which the entity is required to make interest only payments | 15 years | 5 years |  |  |  |  |  |
Amortization period of debt |  | 30 years |  |  |  |  |  |
Borrowings |  | $ 5,500,000 | $ 8,025,000 |  |  |  |  |

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