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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 7 Months Ended 9 Months Ended
Jun. 27, 2025
Mar. 05, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 17, 2025
Aug. 20, 2025
Aug. 07, 2025
Feb. 27, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]                    
Other Liabilities     $ (406,820) $ (406,820)           $ (450,796)
Investments in unconsolidated joint ventures     999,764 999,764           1,093,583
Investments In Affiliates Subsidiaries Associates And Joint Ventures net [1]     949,312 949,312           1,060,074
Payments to Acquire Equity Method Investments       118,524 $ 87,498          
Unconsolidated Joint Ventures [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Other Liabilities     $ (50,500) $ (50,500)           (33,500)
Square 407 Limited Partnership [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Market Square North            
Ownership Percentage     50.00% 50.00%            
Other Liabilities [1]     $ (23,691) $ (23,691)           (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% 33.33%            
Investments in unconsolidated joint ventures [1]     $ 29,209 $ 29,209           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% 30.00%            
Other Liabilities [1]     $ (12,435) $ (12,435)           (11,696)
501 K Street LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       1001 6th Street            
Ownership Percentage     50.00% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 45,772 $ 45,772           45,903
Podium Venture LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       The Hub on Causeway - Podium            
Ownership Percentage     50.00% [3] 50.00% [3]     50.00%      
Investments in unconsolidated joint ventures [1]     $ 55,231 $ 55,231           42,310
Residential Tower Developer LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Hub50House            
Ownership Percentage     50.00% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 33,654 $ 33,654           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% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 11,849 $ 11,849           14,271
Office Venture LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       100 Causeway Street            
Ownership Percentage     50.00% [3] 50.00% [3]     50.00%      
Investments in unconsolidated joint ventures [1]     $ 48,833 $ 48,833           55,810
1265 Main Office JV LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       1265 Main Street            
Ownership Percentage     50.00% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 3,217 $ 3,217           3,476
BNY Tower Holdings LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Dock 72            
Ownership Percentage [4]     50.00% 50.00%            
Other Liabilities [1]     $ (14,326) $ (14,326)           (9,889)
CA-Colorado Center LLC[Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Colorado Center            
Ownership Percentage     50.00% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 69,015 $ 69,015           65,000
7750 Wisconsin Avenue LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       7750 Wisconsin Avenue            
Ownership Percentage     50.00% 50.00%         50.00%  
Investments in unconsolidated joint ventures [1]     $ 47,363 $ 47,363           48,423
BP-M 3HB Venture LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       3 Hudson Boulevard            
Ownership Percentage     25.00% 25.00%            
Investments in unconsolidated joint ventures [1]     $ 110,581 $ 110,581           112,771
Platform 16 Holdings LP [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Platform 16            
Ownership Percentage     55.00% 55.00%            
Investments in unconsolidated joint ventures [1]     $ 58,076 $ 58,076           56,265
Gateway Portfolio Holdings LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Gateway Commons            
Ownership Percentage [5]     50.00% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 125,090 $ 125,090           272,000
Rosecrans-Sepulveda Partners 4, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Beach Cities Media Campus            
Ownership Percentage     50.00% [6] 50.00% [6]   50.00%        
Investments in unconsolidated joint ventures [1]     $ 98 $ 98           27,051
Safeco Plaza REIT LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Safeco Plaza            
Ownership Percentage [7]     33.67% 33.67%            
Investments in unconsolidated joint ventures [1]     $ 121 $ 121           0
Safeco Plaza REIT LLC | Company's Share [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     33.00% 33.00%            
360 PAS Holdco LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       360 Park Avenue South            
Ownership Percentage     71.11% [8] 71.11% [8]       71.11%    
Investments in unconsolidated joint ventures [1]     $ 93,988 $ 93,988           74,592
360 PAS Holdco LLC | Company's Share [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     35.79% 35.79%            
PR II BXP Reston Gateway LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       Skymark - Reston Next Residential            
Ownership Percentage     20.00% 20.00%            
Investments in unconsolidated joint ventures [1]     $ 14,702 $ 14,702           14,844
751 Gateway Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       751 Gateway            
Ownership Percentage     49.00% 49.00%            
Investments in unconsolidated joint ventures [1]     $ 118,509 $ 118,509           99,701
200 Fifth Avenue JV LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       200 Fifth Avenue            
Ownership Percentage     26.69% 26.69%            
Investments in unconsolidated joint ventures [1]     $ 75,376 $ 75,376           70,673
ABXP Worldgate Investments LLC                    
Schedule of Equity Method Investments [Line Items]                    
Properties       13100 and 13150 Worldgate Drive            
Ownership Percentage     50.00% 50.00%            
Investments in unconsolidated joint ventures [1]     $ 19,855 $ 19,855           $ 18,225
Entity Owning Land And Infrastructure Of Project [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     33.33% 33.33%            
Safeco Partner Entity One [Member] | Company's Share [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     1.00% 1.00%            
Safeco Partner Entity Two | Company's Share [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     1.00% 1.00%            
360 Park Avenue South Partners Entity | Company's Share [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     1.00% 1.00%            
360 PAS Holdco LLC (indirect ownership) | Company's Share [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership Percentage     35.02% 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% [9] 19.46% [9]            
Investments in unconsolidated joint ventures [1]     $ 19,813 $ 19,813            
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 [9],[10]     0.00% 0.00%            
Investments in unconsolidated joint ventures [1]     $ 12,014 $ 12,014            
Payments to Acquire Equity Method Investments     $ 11,900              
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%   20.00% [9] 20.00% [9]            
Investments in unconsolidated joint ventures [1]     $ 7,398 $ 7,398            
17 Hartwell Avenue JV LLC | Joint Venture Partner [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Payments to Acquire Equity Method Investments $ 23,000                  
[1] Investments with deficit balances aggregating approximately $50.5 million and $33.5 million at September 30, 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] In conjunction with the execution of the mortgage loan signed 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.
[4] This investment includes net equity balances from the amenity joint venture.
[5] During the three months ended September 30, 2025, the Company recognized an other-than-temporary impairment loss on its investment.
[6] On September 17, 2025, the joint venture completed the sale of Beach Cities Media Campus, a land parcel, located in El Segundo, California.
[7] 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.
[8] 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.
[9] This entity is a VIE (See Note 2).
[10] 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.