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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Schedule of Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 02, 2023
Nov. 30, 2022
Feb. 02, 2021
Dec. 21, 2020
Schedule of Equity Method Investments [Line Items]              
Carrying Amount $ 552,494 $ 532,224          
Company's unconsolidated real estate venture Income (Loss) (77,915) (22,016) $ (26,697)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 1,412,758 1,204,779          
Commerce Square Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 78.00%     8.00%      
Carrying Amount $ 272,216 238,105          
Company's unconsolidated real estate venture Income (Loss) (18,791) (12,128) (15,501)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 220,000 206,737          
Mid-Atlantic Office JV              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 40.00%           40.00%
Carrying Amount $ 0 31,005          
Company's unconsolidated real estate venture Income (Loss) (26,448) 412 932        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 132,770 128,904          
Herndon Innovation Center Metro Portfolio Venture, LLC              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 15.00%            
Carrying Amount $ 3,518 15,304          
Company's unconsolidated real estate venture Income (Loss) (11,854) (536) (174)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 233,443 207,302          
MAP Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 50.00%            
Carrying Amount $ (48,733) (35,411)          
Company's unconsolidated real estate venture Income (Loss) (10,580) (8,340) (8,683)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 179,842 182,053          
Cira Square              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 20.00%            
Carrying Amount $ 25,242 27,815          
Company's unconsolidated real estate venture Income (Loss) (2,474) (985) 0        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 257,700 257,700          
4040 Wilson Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 50.00%            
Carrying Amount $ 29,419 29,633          
Company's unconsolidated real estate venture Income (Loss) (2,536) (1,211) (2,258)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 145,000 145,070          
1919 Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 50.00%       50.00%    
Carrying Amount $ 0 0          
Company's unconsolidated real estate venture Income (Loss) 0 1,392 427        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 0 0          
Brandywine - AI Venture LLC              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 50.00%            
Carrying Amount $ 0 0          
Company's unconsolidated real estate venture Income (Loss) 0 0 (721)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 0 0          
3025 JFK Boulevard              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 58.00%         55.00%  
Carrying Amount $ 62,034 57,630          
Company's unconsolidated real estate venture Income (Loss) (4,456) (35) (118)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 152,032 60,118          
JBG 51 N Street              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 70.00%            
Carrying Amount $ 21,150 21,208          
Company's unconsolidated real estate venture Income (Loss) (435) (382) (402)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 0 0          
JBG 1250 First Street Office              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 70.00%            
Carrying Amount $ 17,843 17,759          
Company's unconsolidated real estate venture Income (Loss) (269) (195) (199)        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 0 0          
3151 Market Street Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 64.00%            
Carrying Amount $ 90,645 63,751          
Company's unconsolidated real estate venture Income (Loss) (72) (8) 0        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 0 0          
One Uptown - Office              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 57.00%            
Carrying Amount $ 47,036 34,980          
Company's unconsolidated real estate venture Income (Loss) 0 0 0        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 51,701 16,895          
One Uptown - Multifamily              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 50.00%            
Carrying Amount $ 32,124 30,445          
Company's unconsolidated real estate venture Income (Loss) 0 0 $ 0        
Unconsolidated Real Estate Venture Debt at 100%, gross $ 40,270 $ 0