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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Loans Receivable and Notes Receivable (Details) - Multifamily - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Ironwood | Tax Increment Financing |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Loan commitment | $ 6.6 |  | $ 6.4 | $ 6.6
Interest rate on mortgages payable | 4.50% |  |  |
Minneapolis, Minnesota | Construction Loans |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Loan commitment |  | $ 29.9 |  |
Interest rate on mortgages payable |  | 4.50% |  |
Mortgage loans receivable |  |  | 29.9 | $ 24.7
Minneapolis, Minnesota | Mezzanine Loan |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Loan commitment |  | $ 15.3 |  |
Interest rate on mortgages payable |  | 11.50% |  |
Mortgage loans receivable |  |  | $ 13.4 |

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