Annual report pursuant to Section 13 and 15(d)

Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details)

v3.22.4
Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
property
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Dec. 22, 2020
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated real estate joint ventures $ 21,460 $ 39,889    
Other liabilities $ 18,556 17,729    
Unconsolidated Real Estate Joint Ventures        
Schedule of Equity Method Investments [Line Items]        
Number of real estate properties | property 21      
Real estate equity method investments $ 20,001 39,889    
Investment in unconsolidated real estate joint ventures 21,500      
Other liabilities $ 1,500      
BREIT COPT DC JV LLC        
Schedule of Equity Method Investments [Line Items]        
Nominal Ownership % 10.00%      
Number of real estate properties | property 9      
Real estate equity method investments $ 11,568 12,460    
Quark        
Schedule of Equity Method Investments [Line Items]        
Nominal Ownership % 10.00%      
Number of real estate properties | property 2      
Real estate equity method investments $ 6,758 $ 0    
BRE-COPT 3        
Schedule of Equity Method Investments [Line Items]        
Nominal Ownership % 10.00% 10.00%    
Number of real estate properties | property 2      
Real estate equity method investments $ 3,134 $ 11,850    
BRE-COPT 2        
Schedule of Equity Method Investments [Line Items]        
Nominal Ownership % 10.00%   10.00% 10.00%
Number of real estate properties | property 8      
Real estate equity method investments $ (1,459) 15,579    
Difference between the joint venture's cost basis and the entity's share of underlying equity in the net assets $ 7,000 $ 7,200