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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