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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Dexter) (Details) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2018 USD ($) | Oct. 28, 2009 USD ($) item | Oct. 31, 2009 USD ($) | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Investments in joint venture |  |  |  | $ 1,430,402 | $ 1,985,680 | $ 7,212,044
Number of units | item |  |  |  | 913 | 913 | 913
Outstanding amount of mortgage |  |  |  | $ 281,771,246 | $ 252,370,843 |
Distribution to the Partnership |  |  |  | 4,696,893 | $ 4,477,923 | $ 7,985,835
Mortgages payable |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  | $ 281,771,000 |  |
Dexter Park |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Investments in joint venture |  | $ 15,925,000 |  |  |  | $ 2,943,060
Ownership interest (as a percent) |  | 40.00% |  | 40.00% | 40.00% | 40.00%
Number of units | item |  |  |  | 409 | 409 | 409
Outstanding amount of mortgage | $ 82,000,000 |  |  |  |  |
Distribution to the Partnership | 41,200,000 |  |  |  |  |
Defeasance cost |  |  |  | $ 3,830,000 |  |
Dexter Park |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Purchase price of real estate properties |  | $ 129,500,000 |  |  |  |
Dexter Park | Mortgage, 5.57%, Due 2019 |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Loan amount |  |  | $ 89,914,000 |  |  |
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 |  |  |  |
John Hancock | Dexter Park |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Loan amount | $ 125,000,000 |  |  |  |  |
Interest rate (as a percent) | 3.99% |  |  |  |  |
Outstanding amount of mortgage |  |  |  | 125,000,000 |  |
General Partnership |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Distribution to the Partnership |  |  |  | 46,969 | $ 44,779 | $ 79,858
General Partnership | Dexter Park |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Distribution to the Partnership | $ 16,500,000 |  |  |  |  |
Carrying value | $ 0 |  |  |  |  |
Defeasance cost |  |  |  | $ 1,532,000 |  |
Defeasance cost (as a percent) |  |  |  | 40.00% |  |
Residential buildings |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Number of units | item |  |  |  | 910 | 910 | 910
Residential buildings | Dexter Park |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Number of units | item |  |  |  | 409 | 409 | 409
Residential buildings | Dexter Park |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |
Number of units | item |  | 409 |  |  |  |

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