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RELATED PARTY TRANSACTIONS - Joint Venture Partners and Affiliates (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Unconsolidated Joint Ventures    
Related Party Transactions    
Aggregate management fees paid to other partners $ 29,000 $ 22,000
Decrease in equity earnings, joint venture transaction 15,000 11,000
Joint Venture Partners and Affiliates    
Related Party Transactions    
Payments for property management services $ 19,000 $ 20,000