SEGMENT REPORTING - Segment Assets and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Segment Reporting Information [Line Items]
Property owned	$ 2,401,427	$ 2,271,170
Less accumulated depreciation	(487,834)	(443,592)
Total property owned	1,913,593	1,827,578
Mortgage loans receivable	0	43,276
Cash and cash equivalents	13,156	31,267	$ 5,194
Restricted cash	1,914	7,358	$ 8,444
Other assets	18,950	30,582
Total Assets	1,947,613	1,940,061
Multifamily
Segment Reporting Information [Line Items]
Property owned	2,374,726	2,244,250
Less accumulated depreciation	(480,113)	(436,004)
Total property owned	1,894,613	1,808,246
All Other
Segment Reporting Information [Line Items]
Property owned	26,701	26,920
Less accumulated depreciation	(7,721)	(7,588)
Total property owned	$ 18,980	$ 19,332