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Equity Method Investment (Details)
2 Months Ended 3 Months Ended 6 Months Ended
Mar. 14, 2019
USD ($)
Mar. 13, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Feb. 25, 2016
story
Schedule of Equity Method Investments [Line Items]              
Investment in equity method investment during period         $ 535,000 $ 3,127,000  
Equity in income of unconsolidated real estate entities     $ 0 $ 0 273,000 0  
22-Story Mixed Use Tower | City Center              
Schedule of Equity Method Investments [Line Items]              
Interests in equity method investments             37.00%
Number stories in the mixed use tower (story) | story             22
Investment in equity method investment during period         $ 500,000    
Equity in income of unconsolidated real estate entities   $ 300,000   0   0  
Dividends from equity investment       $ 0   $ 0  
Office And Retail Portions | City Center              
Schedule of Equity Method Investments [Line Items]              
Interests in equity method investments 37.00%            
One City Center              
Schedule of Equity Method Investments [Line Items]              
Cash payment $ 23,200,000