RELATED PARTY TRANSACTIONS - PORT II (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Aug. 31, 2020	Sep. 30, 2021	Dec. 31, 2019
PORT II OP LP
Schedule of Equity Method Investments [Line Items]
Payments to acquire investments		$ 5,500
Insufficient fund fees, percent	50.00%
Application fee collected, percent	100.00%
Ownership %		89.70%
PORT II OP LP | Tier 1
Schedule of Equity Method Investments [Line Items]
Base fee, percent of rent collections per year	8.00%
PORT II OP LP | Tier 1 | Maximum
Schedule of Equity Method Investments [Line Items]
Base fee, benchmark of rent collections per year	$ 50,000
PORT II OP LP | Tier 2
Schedule of Equity Method Investments [Line Items]
Base fee, percent of rent collections per year	7.00%
PORT II OP LP | Tier 2 | Maximum
Schedule of Equity Method Investments [Line Items]
Base fee, benchmark of rent collections per year	$ 75,000
PORT II OP LP | Tier 2 | Minimum
Schedule of Equity Method Investments [Line Items]
Base fee, benchmark of rent collections per year	$ 50,000
PORT II OP LP | Tier 3
Schedule of Equity Method Investments [Line Items]
Base fee, percent of rent collections per year	6.00%
PORT II OP LP | Tier 3 | Minimum
Schedule of Equity Method Investments [Line Items]
Base fee, benchmark of rent collections per year	$ 75,000
PORT II OP LP | PORT II OP LP
Schedule of Equity Method Investments [Line Items]
Payments to acquire investments		$ 5,500
Pacific Oak Opportunity Zone Fund I
Schedule of Equity Method Investments [Line Items]
Payments to acquire investments		$ 3,100	$ 20,600
Financing fee as percent of original principal amount of any indebtedness		0.50%