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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Hamilton Bay Apts and Sales) (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2007 item | Jun. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($) item | Jun. 30, 2017 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |
Investments in joint venture | $ |  | $ 2,298,588 | $ 7,212,044 | $ 9,029,233
Number of units |  |  |  | 1,033
Number of units sold |  |  |  | 278
Number of units retained for long-term investment |  |  |  | (690)
Outstanding amount of mortgage | $ |  | $ 253,185,372 | $ 233,221,258 |
Unsold units |  |  |  | 65
Hamilton Bay Apts |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |
Number of units sold |  |  | 29 |
Number of units refinanced | 48 |  |  |
Gain on the sale of real estate | $ |  |  | $ 3,628,000 |
Hamilton Bay Sales |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |
Number of units |  | 6 |  |
Number of units sold |  | 12 |  |
Number of units under a purchase and sale agreement |  | 4 |  |
Gain on the sale of real estate | $ |  | $ 1,751,000 |  |
Residential buildings |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |
Number of units |  |  |  | 1,030
Mortgages payable | Minimum |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |
Interest rate (as a percent) |  | 3.76% |  |
Mortgages payable | Maximum |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |
Interest rate (as a percent) |  | 5.81% |  |

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