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INVESTMENT IN AND ADVANCES TO UNCONSOLIDATED JOINT VENTURES - Additional Information (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2012 | Mar. 31, 2020 USD ($) property | Mar. 31, 2019 USD ($) | Mar. 22, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |
Distributions from operations of investment in unconsolidated joint ventures |  | $ 0 | $ 3,067,000 |
Income (expenses) from investment |  | $ (3,974,000) | (3,863,000) |
Grace Lake JV, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity kicker received with right to convert upon capital event | 25.00% |  |  |
Preferred return used to determine distribution of excess cash flow |  | 8.25% |  |
Percentage of distribution of all excess cash flows and all disposition proceeds upon any sale entitled after consideration of preferred return and return of equity remaining in the property to operating partner |  | 25.00% |  |
Distributions from operations of investment in unconsolidated joint ventures |  | $ 0 | 3,100,000 |
Grace Lake JV, LLC | Ladder Capital Financial Corporation |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of investment of operating partner |  | 81.00% |  |
Grace Lake JV, LLC | LP Units |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  |  |  | 19.00%
Grace Lake JV, LLC | Limited liability company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 19.00% |  |
24 Second Avenue Holdings LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Income (expenses) from investment |  | $ 300,000 | 500,000 |
Interest costs capitalized |  |  | 100,000 |
24 Second Avenue Holdings LLC | Apartment Building |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of real estate properties | property |  | 30 |  |
24 Second Avenue Holdings LLC | Apartment Building | Real Estate Property Sold |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of real estate properties, under contract | property |  | 19 |  |
Real estate properties, under contract |  | $ 49,600,000 |  |
24 Second Avenue Holdings LLC | Other |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of real estate properties | property |  | 1 |  |
24 Second Avenue Holdings LLC | Mezzanine Loan |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Committed amount on credit agreement |  |  | 6,500,000 |
24 Second Avenue Holdings LLC | Co-venturer |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loans payable outstanding from unconsolidated joint venture |  | $ 19,000,000.0 |  |
24 Second Avenue Holdings LLC | Co-venturer | Construction Loan |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Common equity interest |  |  | 35,000,000.0 |
Preferred equity position |  |  | 35,000,000.0 |
Loan refinance |  |  | 50,400,000 |
Committed amount on credit agreement |  |  | $ 48,100,000 |
Remaining capital commitment to operating partner |  | $ 0 |  |

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