Annual report pursuant to Section 13 and 15(d)

Real Estate Joint Ventures (Details 2)

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Real Estate Joint Ventures (Details 2)
$ in Thousands
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Unconsolidated Real Estate Joint Ventures    
Schedule of Equity Method Investments [Line Items]    
Number of real estate properties | property 15  
Real estate equity method investments | $ $ 51,949 $ 39,845
GI-COPT DC Partnership LLC    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00%  
Number of real estate properties | property 6  
Real estate equity method investments | $ $ 37,816 39,845
Variable Interest Entity, Not Primary Beneficiary | BREIT COPT DC JV LLC    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 10.00%  
Number of real estate properties | property 9  
Real estate equity method investments | $ $ 14,133 $ 0