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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Dexter) (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) | Oct. 28, 2009 USD ($) item | Feb. 28, 2007 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) item | Dec. 31, 2017 USD ($) | Mar. 01, 2017 USD ($) | Oct. 03, 2005 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  | $ 1,804,747 | $ 1,804,747 | $ 8,452,484 | $ 7,212,044 |  |
Number of units | item |  |  |  |  |  | 1,033 |  |  |
Outstanding amount of mortgage |  |  |  | 252,781,336 | 252,781,336 |  | $ 233,221,258 |  |
Distribution to the Partnership |  |  |  |  | 3,358,443 | $ 3,358,648 |  |  |
Dexter Park |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Investments in joint venture |  | $ 15,925,000 |  |  |  | $ 2,914,262 |  |  |
Ownership interest (as a percent) |  | 40.00% |  |  |  | 40.00% |  |  |
Number of units | item |  | 409 |  |  |  | 409 |  |  |
Outstanding amount of mortgage | $ 82,000,000 |  |  | 125,000,000 | $ 125,000,000 |  |  |  |
Purchase price of investments |  | $ 129,500,000 |  |  |  |  |  |  |
Distribution to the Partnership | $ 41,200,000 |  |  |  |  |  |  |  |
Dexter Park | Mortgages payable |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.57% |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  | 2 years |  |  |  |  |  |  |
Amortization period of debt |  | 30 years |  |  |  |  |  |  |
Borrowings |  | $ 89,914,000 |  |  |  |  |  |  |
Hamilton Bay Apts |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  | $ 2,238,850 |  |  | $ 2,500,000
Ownership interest (as a percent) |  |  |  |  |  | 50.00% |  |  | 50.00%
Number of units | item |  |  |  |  |  | 48 |  |  | 168
Interest rate (as a percent) |  |  | 5.57% |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  | 5 years |  |  |  |  |  |
Amortization period of debt |  |  | 30 years |  |  |  |  |  |
Purchase price of investments |  |  |  |  |  |  |  |  | $ 30,875,000
Borrowings |  |  | $ 4,750,000 |  |  |  |  |  |
Hamilton Bay Apts | Mortgages payable |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  | $ 2,222,000 |
John Hancock | Dexter Park |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.99% |  |  |  |  |  |  |  |
Defeasance cost |  |  |  | $ 3,830,000 |  |  |  |  |
Defeasance cost (as a percent) |  |  |  | 40.00% | 40.00% |  |  |  |
Loan amount | $ 125,000,000 |  |  |  |  |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Distribution to the Partnership |  |  |  |  | $ 33,584 | $ 33,586 |  |  |
General Partnership | Dexter Park |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Distribution to the Partnership | $ 16,500,000 |  |  |  |  |  |  |  |
General Partnership | John Hancock | Dexter Park |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Defeasance cost |  |  |  | $ 1,532,000 |  |  |  |  |
Residential buildings |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  | 1,030 |  |  |
Residential buildings | Dexter Park |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  | 409 |  |  |
Residential buildings | Hamilton Bay Apts |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  | 48 |  |  |

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