INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Jul. 31, 2023	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment balance	$ 70,379,000		$ 70,379,000				$ 70,842,000
Real estate held for investment, net	1,126,798,000		1,126,798,000				1,216,898,000
Total assets	1,406,391,000		1,406,391,000				1,559,245,000
Total liabilities	1,136,437,000		1,136,437,000				1,142,852,000
Total equity	269,954,000	$ 418,294,000	269,954,000	$ 418,294,000		$ 336,528,000	416,393,000	$ 461,373,000	$ 482,059,000
Total revenues	35,846,000	43,605,000	109,868,000	125,671,000
Operating loss	(13,318,000)	(5,370,000)	(12,424,000)	(29,905,000)
Net income (loss)	(62,543,000)	(31,000,000)	(139,794,000)	(44,101,000)
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Real estate held for investment, net	425,312,000		425,312,000				471,503,000
Total assets	498,503,000		498,503,000				546,142,000
Notes payable related to real estate held for investment, net	410,421,000		410,421,000				490,302,000
Total liabilities	427,807,000		427,807,000				501,861,000
Total equity	70,696,000		70,696,000				44,281,000
Total revenues	9,793,000	11,154,000	31,257,000	35,724,000
Operating loss	(61,553,000)	(14,156,000)	(89,634,000)	(26,216,000)
Net income (loss)	$ 6,733,000	$ (14,141,000)	$ (21,248,000)	(26,177,000)
110 William Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property	1		1
Ownership percentage					77.50%
Investment balance	$ 43,659,000		$ 43,659,000				0
Payments to acquire equity method investments			28,400,000
110 William Joint Venture | Funded Capital Commitments
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments			$ 25,300,000
353 Sacramento Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property	1		1
Ownership percentage	55.00%		55.00%
Investment balance	$ 0		$ 0				45,173,000
Impairment losses			$ 14,800,000	$ 0
Pacific Oak Opportunity Zone Fund I
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property	3		3
Ownership percentage	46.00%		46.00%
Investment balance	$ 26,720,000		$ 26,720,000				$ 25,669,000