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Investments in Unconsolidated Real Estate Ventures - Summary of disposition activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Income from unconsolidated real estate ventures, net $ (26,999) $ (17,429) $ (2,070)
CBREI Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 10.00%    
Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 18.00%    
Disposal Group, Disposed of by Sale      
Schedule of Equity Method Investments [Line Items]      
Income from unconsolidated real estate ventures, net $ 411 $ 6,797 $ 28,326
Stonebridge at Potomac Town Center | Disposal Group, Disposed of by Sale | CBREI Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 10.00%    
Gross sales price $ 172,500    
Repayment of mortgage 79,600    
Income from unconsolidated real estate ventures, net $ 641    
Rosslyn Gateway Assets | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 18.00%    
Gross sales price $ 52,000    
Repayment of mortgage 44,844    
Income from unconsolidated real estate ventures, net $ (230)    
1900 N Street | Disposal Group, Disposed of by Sale | Canadian Pension Plan Investment Board (CPPIB)      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   55.00%  
Gross sales price   $ 265,000  
Repayment of mortgage   151,709  
Income from unconsolidated real estate ventures, net   $ 529  
The Gale Eckington | Disposal Group, Disposed of by Sale | CBREI Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   5.00%  
Gross sales price   $ 215,550  
Repayment of mortgage   110,813  
Income from unconsolidated real estate ventures, net   $ 618  
Galvan | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   1.80%  
Gross sales price   $ 152,500  
Repayment of mortgage   89,500  
Income from unconsolidated real estate ventures, net   407  
Fairway | Disposal Group, Disposed of by Sale | CBREI Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     10.00%
Gross sales price     $ 93,000
Repayment of mortgage     45,343
Income from unconsolidated real estate ventures, net     $ 2,094
Courthouse Metro | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     18.00%
Gross sales price     $ 3,000
Income from unconsolidated real estate ventures, net     $ 2,352
5615 Fishers Lane | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     18.00%
Gross sales price     $ 6,500
Income from unconsolidated real estate ventures, net     $ 743
500 L'Enfant Plaza | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     49.00%
Gross sales price     $ 166,500
Repayment of mortgage     80,000
Income from unconsolidated real estate ventures, net     $ 23,137
The Alaire,The Terano and Parklawn Drive | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Gross sales price   137,500  
Repayment of mortgage   79,829  
Income from unconsolidated real estate ventures, net   $ 5,243  
The Alaire,The Terano and Parklawn Drive | Minimum | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   1.80%  
The Alaire,The Terano and Parklawn Drive | Maximum | Disposal Group, Disposed of by Sale | Landmark      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   18.00%