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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Other Liabilities $ (418,813) $ (450,918)
Investments in unconsolidated joint ventures 1,780,959 1,715,911
Investments In Affiliates Subsidiaries Associates And Joint Ventures net [1] 1,703,032 1,630,485
Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Other Liabilities $ (77,900) (85,400)
Square 407 Limited Partnership [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Market Square North  
Ownership Percentage 50.00%  
Other Liabilities [1] $ (6,053) (6,198)
BP/CRF Metropolitan Square LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Metropolitan Square  
Ownership Percentage 20.00%  
Other Liabilities [1] $ (37,654) (37,629)
901 New York Avenue LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties 901 New York Avenue  
Ownership Percentage [2] 25.00%  
Other Liabilities [1] $ (12,150) $ (12,493)
901 New York Avenue LLC (economic ownership) [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership Percentage 50.00% 50.00%
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] $ 31,398 $ 31,971
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] $ (8,559) (9,185)
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] $ 43,443 42,922
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] $ 44,542 46,839
Residential Tower Developer LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Hub50House  
Ownership Percentage 50.00%  
Investments in unconsolidated joint ventures [1] $ 44,214 45,414
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] $ 12,750 12,366
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] $ 59,550 59,716
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] $ 3,583 3,465
BNY Tower Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Dock 72  
Ownership Percentage [4] 50.00%  
Other Liabilities [1] $ (13,511) (19,921)
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] $ 235,846 233,862
7750 Wisconsin Avenue LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties 7750 Wisconsin Avenue  
Ownership Percentage 50.00%  
Investments in unconsolidated joint ventures [1] $ 50,789 52,152
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] $ 115,878 116,397
SMBP Venture LP [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Santa Monica Business Park  
Ownership Percentage 55.00%  
Investments in unconsolidated joint ventures [1] $ 161,368 164,735
Platform 16 Holdings LP [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Platform 16  
Ownership Percentage [5] 55.00%  
Investments in unconsolidated joint ventures [1] $ 184,642 158,109
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] $ 349,055 324,038
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] $ 27,013 27,000
Safeco Plaza REIT LLC    
Schedule of Equity Method Investments [Line Items]    
Properties Safeco Plaza  
Ownership Percentage [6] 33.67%  
Investments in unconsolidated joint ventures [1] $ 70,331 69,785
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 [7] 42.21%  
Investments in unconsolidated joint ventures [1] $ 112,219 114,992
360 PAS Holdco LLC | Company's Share [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership Percentage 35.79%  
360 PAS Holdco LLC | Joint Venture Partner [Member] | Scenario, Plan    
Schedule of Equity Method Investments [Line Items]    
Ownership Percentage 58.00%  
PR II BXP Reston Gateway LLC    
Schedule of Equity Method Investments [Line Items]    
Properties Reston Next Residential  
Ownership Percentage 20.00%  
Investments in unconsolidated joint ventures [1] $ 11,796 11,351
751 Gateway Holdings LLC    
Schedule of Equity Method Investments [Line Items]    
Properties 751 Gateway  
Ownership Percentage 49.00%  
Investments in unconsolidated joint ventures [1] $ 89,025 80,714
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] $ 116,335 $ 120,083
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] $ 17,182  
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 Park Avenue South Partners 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 5.837%  
[1] Investments with deficit balances aggregating approximately $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.
[2] The Company’s economic ownership has increased based on the achievement of certain return thresholds. At June 30, 2023 and December 31, 2022, the Company’s economic ownership was approximately 50%.
[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] This property includes net equity balances from the amenity joint venture.
[5] At December 31, 2022, this entity was a VIE.
[6] The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture.
[7] The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.