REAL ESTATE - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Real Estate [Line Items]
Acquired in-place leases, net	$ 28,414	$ 29,085
Prepaid expenses and other	9,004	9,136
Assets acquired	3,011,134	3,017,927
Accounts payable and accrued expenses	(68,797)	(64,531)
Security deposits payable	(8,280)	(7,855)
Other liabilities and deferred credits	(79,142)	(86,215)
Liabilities assumed	(1,805,247)	$ (1,807,804)
Office Building | Bel-Spring 520
Real Estate [Line Items]
Land	13,744
Building	27,793
Land improvements	713
Furniture, fixtures, and equipment	1,833
Total real estate	44,083
Acquired in-place leases, net	2,036
Prepaid expenses and other	10
Assets acquired	46,129
Accounts payable and accrued expenses	(14)
Security deposits payable	(189)
Other liabilities and deferred credits	(641)
Liabilities assumed	$ (844)