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INVESTMENT IN UNCONSOLIDATED ENTITIES - Investment in Pacific Oak Opportunity Zone Fund I (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
property
Dec. 31, 2020
USD ($)
unit
Dec. 31, 2019
USD ($)
unit
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated entities $ 80,889 $ 79,666  
Pacific Oak Opportunity Zone Fund I      
Schedule of Equity Method Investments [Line Items]      
Number of units in real estate property | unit   7 91
Investments     $ 20,600
Investments, fair value   $ 1,500  
Investments in unconsolidated entities 25,077 $ 24,996  
Acquisition related costs $ 200    
Number of joint venture with real estate under development | property 3    
Gain (Loss) on Investments $ 200    
Pacific Oak Opportunity Zone Fund I | POSOR II Merger      
Schedule of Equity Method Investments [Line Items]      
Number of units in real estate property | unit   13  
Investments   $ 2,900  
Investments, fair value   $ 3,000