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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 05, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Sep. 17, 2025
Aug. 20, 2025
Aug. 07, 2025
Jun. 27, 2025
Feb. 27, 2025
Schedule of Equity Method Investments [Line Items]                  
Other Liabilities   $ (386,074) $ (450,796)            
Investments in unconsolidated joint ventures   999,309 1,093,583            
Investments In Affiliates Subsidiaries Associates And Joint Ventures net [1]   983,710 1,060,074            
Payments to Acquire Equity Method Investments   $ 258,752 132,096 $ 192,650          
Square 407 Limited Partnership [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Properties   Market Square North              
Ownership Percentage [2]   50.00%              
Other Liabilities [1]   $ 0 (11,924)            
WP Project Developer LLC [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Properties   Wisconsin Place Land and Infrastructure              
Ownership Percentage [3]   33.33%              
Investments in unconsolidated joint ventures [1]   $ 29,085 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]   $ (12,655) (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]   $ 45,724 45,903            
Podium Venture LLC [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Properties   The Hub on Causeway - Podium              
Ownership Percentage   50.00% [4]       50.00%      
Investments in unconsolidated joint ventures [1]   $ 54,742 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]   $ 33,942 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]   $ 12,021 14,271            
Office Venture LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   100 Causeway Street              
Ownership Percentage   50.00% [4]       50.00%      
Investments in unconsolidated joint ventures [1]   $ 48,924 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]   $ 3,091 3,476            
BNY Tower Holdings LLC [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Properties   Dock 72              
Ownership Percentage [5]   50.00%              
Other Liabilities   $ (400) (9,889) [1]            
Investments in unconsolidated joint ventures [1]   $ 83,547              
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]   $ 69,959 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]   $ 47,144 48,423            
BP-M 3HB Venture LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   3 Hudson Boulevard              
Ownership Percentage   25.00%              
Investments in unconsolidated joint ventures [1]   $ 109,451 112,771            
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]   $ 58,561 56,265            
Gateway Portfolio Holdings LLC [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Properties   Gateway Commons              
Ownership Percentage [6]   50.00%              
Investments in unconsolidated joint ventures [1]   $ 125,576 272,000            
Rosecrans-Sepulveda Partners 4, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   Beach Cities Media Campus              
Ownership Percentage   50.00% [7]     50.00%        
Investments in unconsolidated joint ventures [1]   $ 272 27,051            
Safeco Plaza REIT LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   Safeco Plaza              
Ownership Percentage [8]   33.67%              
Other Liabilities [1]   $ (2,557)              
Investments in unconsolidated joint ventures [1]     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   71.11% [9]         71.11%    
Investments in unconsolidated joint ventures [1]   $ 104,778 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]   $ 14,506 14,844            
751 Gateway Holdings LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   751 Gateway              
Ownership Percentage [10]   49.00%              
Investments in unconsolidated joint ventures [1]   $ 0 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]   $ 74,747 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]   $ 21,995 18,225            
CAB 290 Coles Venture LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   290 Coles Street - Common Equity              
Ownership Percentage 19.46% 19.46% [11]              
Investments in unconsolidated joint ventures [1]   $ 19,928              
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 [11],[12]   0.00%              
Investments in unconsolidated joint ventures [1]   $ 30,362              
Payments to Acquire Equity Method Investments   29,900              
CAB 290 Coles Holdco LLC | Maximum [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Payments to Acquire Equity Method Investments   $ 65,000              
Internal Rate of return on preferred equity   13.00%              
17 Hartwell Avenue JV LLC                  
Schedule of Equity Method Investments [Line Items]                  
Properties   17 Hartwell Avenue              
Ownership Percentage   20.00% [11]           20.00%  
Investments in unconsolidated joint ventures [1]   $ 10,567              
Unconsolidated Joint Ventures [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Other Liabilities   $ (15,600) $ (33,500)            
Entity Owning Land And Infrastructure Of Project [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage   33.33%              
Safeco Partner Entity Two | 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%              
360 Park Avenue South Partners Entity | Company's Share [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage   1.00%              
Safeco Partner Entity One [Member] | Company's Share [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage   1.00%              
[1] Investments with deficit balances aggregating approximately $15.6 million and $33.5 million at December 31, 2025 and December 31, 2024, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.
[2] On November 10, 2025, the Company completed the sale of its ownership interest in the joint venture.
[3] 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.
[4] In conjunction with the execution of the mortgage loan on September 30, 2025 (described below), Podium Venture LLC and Office Venture LLC were created for structuring purposes and did not change any of the partner rights previously held by the partners of Podium Developer LLC or Office Tower Developer LLC, respectively.
[5] This investment includes net equity balances from the amenity joint venture. The amenity joint venture had a deficit balance of approximately $0.4 million at December 31, 2025.
[6] During the year ended December 31, 2025, the Company recognized an other-than-temporary impairment loss on its investment. On January 2, 2026, the Company completed the sale of its ownership interest in the joint venture (See Note 17).
[7] On September 17, 2025, the joint venture completed the sale of the land parcel.
[8] 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.
[9] 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.
[10] On December 30, 2025, the joint venture completed the sale of the property.
[11] This entity is a VIE (See Note 2).
[12] 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 will earn and accrue 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.