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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 05, 2025
Mar. 31, 2025
Mar. 31, 2024
Feb. 27, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]          
Other Liabilities   $ (450,165)     $ (450,796)
Investments in unconsolidated joint ventures   1,137,732     1,093,583
Investments In Affiliates Subsidiaries Associates And Joint Ventures net [1]   1,089,547     1,060,074
Payments to Acquire Equity Method Investments   52,611 $ 26,457    
Unconsolidated Joint Ventures [Member]          
Schedule of Equity Method Investments [Line Items]          
Other Liabilities   $ (48,200)     (33,500)
Square 407 Limited Partnership [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Market Square North      
Ownership Percentage   50.00%      
Other Liabilities [1]   $ (23,756)     (11,924)
WP Project Developer LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Wisconsin Place Land and Infrastructure      
Ownership Percentage [2]   33.33%      
Investments in unconsolidated joint ventures [1]   $ 29,668     29,775
500 North Capitol Venture LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   500 North Capitol Street, NW      
Ownership Percentage   30.00%      
Other Liabilities [1]   $ (11,952)     (11,696)
501 K Street LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   1001 6th Street      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 45,903     45,903
Podium Developer LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   The Hub on Causeway - Podium      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 41,153     42,310
Residential Tower Developer LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Hub50House      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 40,492     42,493
Hotel Tower Developer LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   The Hub on Causeway - Hotel Air Rights      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 14,464     14,271
Office Tower Developer LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   100 Causeway Street      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 55,821     55,810
1265 Main Office JV LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   1265 Main Street      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 3,461     3,476
BNY Tower Holdings LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Dock 72      
Ownership Percentage [3]   50.00%      
Other Liabilities [1]   $ (12,477)     (9,889)
CA-Colorado Center LLC[Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Colorado Center      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 68,235     65,000
7750 Wisconsin Avenue LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   7750 Wisconsin Avenue      
Ownership Percentage   50.00%   50.00%  
Investments in unconsolidated joint ventures [1]   $ 48,183     48,423
BP-M 3HB Venture LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   3 Hudson Boulevard      
Ownership Percentage   25.00%      
Investments in unconsolidated joint ventures [1]   $ 111,865     112,771
Platform 16 Holdings LP [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Platform 16      
Ownership Percentage   55.00%      
Investments in unconsolidated joint ventures [1]   $ 57,775     56,265
Gateway Portfolio Holdings LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Properties   Gateway Commons      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 272,872     272,000
Rosecrans-Sepulveda Partners 4, LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   Beach Cities Media Campus      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 27,060     27,051
Safeco Plaza REIT LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   Safeco Plaza      
Ownership Percentage [4]   33.67%      
Investments in unconsolidated joint ventures [1]   $ 132     0
Safeco Plaza REIT LLC | Company's Share [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   33.00%      
360 PAS Holdco LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   360 Park Avenue South      
Ownership Percentage [5]   71.11%      
Investments in unconsolidated joint ventures [1]   $ 79,883     74,592
360 PAS Holdco LLC | Company's Share [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   35.79%      
PR II BXP Reston Gateway LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   Skymark - Reston Next Residential      
Ownership Percentage   20.00%      
Investments in unconsolidated joint ventures [1]   $ 14,691     14,844
751 Gateway Holdings LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   751 Gateway      
Ownership Percentage   49.00%      
Investments in unconsolidated joint ventures [1]   $ 121,058     99,701
200 Fifth Avenue JV LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   200 Fifth Avenue      
Ownership Percentage   26.69%      
Investments in unconsolidated joint ventures [1]   $ 67,165     70,673
ABXP Worldgate Investments LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   13100 and 13150 Worldgate Drive      
Ownership Percentage   50.00%      
Investments in unconsolidated joint ventures [1]   $ 18,487     $ 18,225
Entity Owning Land And Infrastructure Of Project [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   33.33%      
Safeco Partner Entity One [Member] | Company's Share [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   1.00%      
Safeco Partner Entity Two | Company's Share [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   1.00%      
360 Park Avenue South Partners Entity | Company's Share [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   1.00%      
360 PAS Holdco LLC (indirect ownership) | Company's Share [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Percentage   35.02%      
CAB 290 Coles Venture LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   290 Coles Street - Common Equity      
Ownership Percentage 19.46% 19.46% [6]      
Investments in unconsolidated joint ventures [1]   $ 19,364      
Payments to Acquire Equity Method Investments $ 20,000        
CAB 290 Coles Holdco LLC          
Schedule of Equity Method Investments [Line Items]          
Properties   290 Coles Street - Preferred Equity      
Ownership Percentage [6],[7]   0.00%      
Investments in unconsolidated joint ventures [1]   $ 0      
CAB 290 Coles Holdco LLC | Maximum [Member] | Forecast          
Schedule of Equity Method Investments [Line Items]          
Payments to Acquire Equity Method Investments $ 65,000        
Internal Rate of return on preferred equity 13.00%        
[1] Investments with deficit balances aggregating approximately $48.2 million and $33.5 million at March 31, 2025 and December 31, 2024, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.
[2] The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.33% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.
[3] This property includes net equity balances from the amenity joint venture.
[4] The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1.0% interest in each of the two entities through which each partner owns its interest in the joint venture.
[5] The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 35.02% indirect ownership in the joint venture, and (3) an additional 1.0% interest in the entity through which the partner owns its interest in the joint venture.
[6] This entity is a VIE (See Note 2).
[7] The Company agreed to fund up to $65.0 million of the required capital through its preferred equity investment. The Company’s preferred equity investment is expected to earn a 13.0% internal rate of return (“IRR”) and is to be redeemed, in full, upon the earlier of two years after stabilization of the property or March 5, 2030.