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Related Party Transactions - Joint Venture Partners and Affiliates (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Unconsolidated Joint Ventures        
Related Party Transactions        
Aggregate management fees paid to other partners $ 27,000 $ 29,000 $ 68,000 $ 85,000
Decrease in equity earnings, joint venture transaction 14,000 15,000 34,000 42,000
Leasing commission and development fees paid to unconsolidated joint venture partner     75,000  
Joint Venture Partners and Affiliates        
Related Party Transactions        
Real estate property management costs $ 20,000 $ 21,000 $ 56,000 $ 62,000