Quarterly report pursuant to Section 13 or 15(d)

Real Estate Joint Ventures - Investments in Unconsolidated Real Estate Joint Ventures (Details)

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Real Estate Joint Ventures - Investments in Unconsolidated Real Estate Joint Ventures (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
property
Dec. 31, 2023
USD ($)
Schedule of Equity Method Investments [Line Items]    
Investment in unconsolidated real estate joint ventures $ 40,597 $ 41,052
Other liabilities $ 16,406 18,996
Unconsolidated Real Estate Joint Ventures    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | property 24  
Carrying value of Investments $ 37,615 38,275
Other liabilities $ 3,000 2,800
Redshift JV LLC    
Schedule of Equity Method Investments [Line Items]    
Nominal Ownership % 10.00%  
Number of Properties | property 3  
Carrying value of Investments $ 21,021 21,053
BREIT COPT DC JV LLC    
Schedule of Equity Method Investments [Line Items]    
Nominal Ownership % 10.00%  
Number of Properties | property 9  
Carrying value of Investments $ 10,321 10,629
Quark JV LLC    
Schedule of Equity Method Investments [Line Items]    
Nominal Ownership % 10.00%  
Number of Properties | property 2  
Carrying value of Investments $ 6,722 6,727
B RE COPT DC JV III LLC    
Schedule of Equity Method Investments [Line Items]    
Nominal Ownership % 10.00%  
Number of Properties | property 2  
Carrying value of Investments $ 2,533 2,643
B RE COPT DC JV II LLC    
Schedule of Equity Method Investments [Line Items]    
Nominal Ownership % 10.00%  
Number of Properties | property 8  
Carrying value of Investments $ (2,982) (2,777)
Difference between the joint venture's cost basis and the entity's share of underlying equity in the net assets $ 6,800 $ 6,800