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SEGMENT REPORTING - Segment Assets and Accumulated Depreciation (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Property owned | $ 2,203,606 | $ 1,812,557 |
Less accumulated depreciation | (426,926) | (399,249) |
Total property owned | 1,776,680 | 1,413,308 |
Mortgage loans receivable at fair value | 42,160 | 24,661 |
Cash and cash equivalents | 20,816 | 392 | $ 16,804
Restricted cash | 2,376 | 6,918 | $ 2,199
Other assets | 34,919 | 18,904 |
TOTAL ASSETS | 1,876,951 | 1,464,183 |
Multifamily |  |  |
Segment Reporting Information [Line Items] |  |  |
Property owned | 2,170,321 | 1,727,229 |
Less accumulated depreciation | (414,829) | (368,717) |
Total property owned | 1,755,492 | 1,358,512 |
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Property owned | 33,285 | 85,328 |
Less accumulated depreciation | (12,097) | (30,532) |
Total property owned | $ 21,188 | $ 54,796 |

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. 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