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REAL ESTATE HELD FOR INVESTMENT - Redeemable Non-controlling Interest Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule of Investments [Line Items]        
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest, Total $ (23) $ 0 $ (23) $ 0
PORT OP LP | Battery Point | BPT Holdings, LLC        
Schedule of Investments [Line Items]        
Issuance of PORT OP Units     3,024  
Net loss attributable to redeemable noncontrolling interest     (23)  
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest, Total     $ 3,001