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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2022 | Dec. 31, 2021
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |
Mortgage loans receivable at fair value |  | $ 0 | $ 43,276
Multi Family Same-Store | Ironwood Apartments - New Hope, MN | Tax Increment Financing |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |
Loan commitment |  | $ 6,100 | 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
Multi-Family Residential | Minneapolis, Minnesota | Mezzanine Loan |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |
Interest rate | 11.50% |  |
Mortgage loans receivable at fair value | $ 15,300 |  | $ 13,400

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