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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Dec. 31, 2020
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Mortgage loans receivable at fair value |  |  | $ 42,160 | $ 24,661
Minneapolis, Minnesota | Construction Loans |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Accrued interest |  |  | 813 |
Multi Family Same-Store | Ironwood Apartments - New Hope, MN | Tax Increment Financing |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Loan commitment |  |  | 6,400 | 6,400
Multi-Family Residential | Ironwood Apartments - New Hope, MN | Tax Increment Financing |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Interest rate | 4.50% |  |  |
Multi-Family Residential | Minneapolis, Minnesota | Construction Loans |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Interest rate |  | 4.50% |  |
Mortgage loans receivable at fair value |  | $ 29,900 | 29,900 | $ 24,700
Multi-Family Residential | Minneapolis, Minnesota | Mezzanine Loan |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Interest rate |  | 11.50% |  |
Mortgage loans receivable at fair value |  | $ 15,300 | $ 11,400 |

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