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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
USD ($)
ft²
payments
Dec. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]    
Other Liabilities $ (417,255) $ (391,441)
Investments in unconsolidated joint ventures 1,593,834 1,482,997
Investments In Affiliates Subsidiaries Associates And Joint Ventures net [1] 1,526,819 1,445,926
Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Other Liabilities $ (67,000) (37,100)
Square 407 Limited Partnership [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Market Square North  
Ownership Percentage 50.00%  
Other Liabilities [1] $ (5,759) (1,205)
BP/CRF Metropolitan Square LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Metropolitan Square  
Ownership Percentage 20.00%  
Other Liabilities [1] $ (39,318) (15,356)
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] $ (12,506) $ (12,597)
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] $ 32,638 $ 33,732
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] $ (9,432) (7,913)
501 K Street LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties 1001 6th Street  
Ownership Percentage [4] 50.00%  
Investments in unconsolidated joint ventures [1] $ 42,922 42,576
Potential additonal payments to joint venture partner | payments 2  
Minimum square footage to make a potential additional payment to joint venture partner (in sqft) | ft² 520,000  
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] $ 48,571 48,980
Residential Tower Developer LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Hub50House  
Ownership Percentage 50.00%  
Investments in unconsolidated joint ventures [1] $ 45,662 47,774
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] $ 12,165 11,505
Office Tower Developer LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties 100 Causeway Street  
Ownership Percentage 50.00%  
Investments in unconsolidated joint ventures [1] $ 59,379 57,687
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] $ 3,358 3,541
BNY Tower Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Dock 72  
Ownership Percentage 50.00%  
Investments in unconsolidated joint ventures [1] $ 26,947 27,343
BNYA Amenity Operator LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Dock 72  
Ownership Percentage 50.00%  
Investments in unconsolidated joint ventures [1] $ 825 1,069
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] $ 234,271 231,479
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] $ 52,656 61,626
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] $ 116,678 116,306
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] $ 166,302 156,639
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] $ 143,558 109,086
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] $ 314,137 327,148
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] $ 27,017 27,106
Entity Owning Land And Infrastructure Of Project [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership Percentage 33.33%  
Safeco Plaza REIT LLC    
Schedule of Equity Method Investments [Line Items]    
Properties Safeco Plaza  
Ownership Percentage [7] 33.67%  
Investments in unconsolidated joint ventures [1] $ 70,889 72,545
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 [8] 42.21%  
Investments in unconsolidated joint ventures [1] $ 112,772 $ 106,855
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%  
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 PAS Holdco LLC (indirect ownership) | Company's Share [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership Percentage 5.837%  
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%  
PR II BXP Reston Gateway LLC    
Schedule of Equity Method Investments [Line Items]    
Properties Reston Next Residential  
Ownership Percentage [9] 20.00%  
Investments in unconsolidated joint ventures [1] $ 11,267  
PR II BXP Reston Gateway LLC | Joint Venture Partner [Member] | Scenario, Plan    
Schedule of Equity Method Investments [Line Items]    
Ownership Percentage 80.00%  
751 Gateway Holdings LLC    
Schedule of Equity Method Investments [Line Items]    
Properties 751 Gateway  
Ownership Percentage [6] 49.00%  
Investments in unconsolidated joint ventures [1] $ 71,820  
[1] Investments with deficit balances aggregating approximately $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, 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 September 30, 2022 and December 31, 2021, 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] Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project in excess of 520,000 square feet and achieving certain project returns at stabilization.
[5] This entity is a VIE (See Note 2).
[6] On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.
[7] 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.
[8] 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.
[9] The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.