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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
ASSETS      
Total real estate $ 20,899,879 $ 21,050,255  
Total assets 26,166,164 26,084,980  
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Mortgage and notes payable, net 4,280,067 4,276,609  
Other Liabilities 386,074 450,796  
Members’/Partners’ equity 5,147,190 5,413,306  
Total liabilities and equity / capital 26,166,164 26,084,980  
Carying value of the Company's investment in unconsolidated joint ventures 999,309 1,093,583  
Right of use assets - operating leases 325,841 334,767  
Sales-type lease receivable, net 15,929 14,923  
Lease Liabilities - Operating Leases 389,213 392,686  
Impairment loss 85,803 13,615 $ 0
Gateway Commons Complex [Member] | Unconsolidated Properties      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Impairment loss 425,800    
Safeco Plaza | Unconsolidated Properties      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Impairment loss 319,500    
Unconsolidated Joint Ventures [Member]      
ASSETS      
Total real estate [2] 4,786,058 [1] 5,748,198  
Other assets [3] 672,776 703,096  
Total assets 5,458,834 6,451,294  
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Mortgage and notes payable, net 2,905,065 3,206,723  
Other Liabilities [4] 189,125 292,125  
Members’/Partners’ equity 2,364,644 2,952,446  
Total liabilities and equity / capital 5,458,834 6,451,294  
Company's share of equity 1,084,806 1,344,543  
Basis differentials [5] (101,096) [1] (284,469)  
Carying value of the Company's investment in unconsolidated joint ventures [6] 983,710 1,060,074  
Right of use assets - operating leases 17,900 19,000  
Sales-type lease receivable, net 14,400 14,100  
Lease Liabilities - Operating Leases 30,500 30,500  
Impairment loss 745,224 [7] 0 0
Equity Method Investment, Other-than-Temporary Impairment [8] 145,133 341,338 272,603
Unconsolidated Joint Ventures [Member]      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Other Liabilities 15,600 33,500  
Colorado Center      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Basis differentials 131,356 127,632  
Carying value of the Company's investment in unconsolidated joint ventures [9] 69,959 65,000  
Equity Method Investment, Other-than-Temporary Impairment   168,400  
Colorado Center | Unconsolidated Joint Ventures [Member] | Unconsolidated Properties      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment   168,400  
200 Fifth Avenue JV LLC      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Basis differentials 48,289 49,656  
Carying value of the Company's investment in unconsolidated joint ventures [9] 74,747 70,673  
200 Fifth Avenue JV LLC | Unconsolidated Joint Ventures [Member]      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment     33,400
Gateway Commons Complex [Member]      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Basis differentials (700) (74,500)  
Carying value of the Company's investment in unconsolidated joint ventures [9] 125,576 272,000  
Equity Method Investment, Other-than-Temporary Impairment 145,100 126,100  
Gateway Commons Complex [Member] | Unconsolidated Joint Ventures [Member] | Unconsolidated Properties      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment   126,100  
Safeco Plaza REIT LLC      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Other Liabilities [9] 2,557    
Basis differentials 32,905 (75,576)  
Carying value of the Company's investment in unconsolidated joint ventures [9]   0  
Equity Method Investment, Other-than-Temporary Impairment   46,800  
Safeco Plaza REIT LLC | Unconsolidated Joint Ventures [Member]      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment     29,900
Safeco Plaza REIT LLC | Unconsolidated Joint Ventures [Member] | Unconsolidated Properties      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment   46,800  
Dock 72      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Other Liabilities 400 9,889 [9]  
Basis differentials (88,420) (92,054)  
Carying value of the Company's investment in unconsolidated joint ventures [9] 83,547    
360 Park Avenue South      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Basis differentials (110,815) (113,265)  
Carying value of the Company's investment in unconsolidated joint ventures [9] 104,778 74,592  
360 Park Avenue South | Unconsolidated Joint Ventures [Member]      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment     54,000
Platform 16      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Basis differentials (142,677) (142,698)  
Carying value of the Company's investment in unconsolidated joint ventures [9] 58,561 56,265  
Platform 16 | Unconsolidated Joint Ventures [Member]      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Equity Method Investment, Other-than-Temporary Impairment     $ 155,200
Remaining Other Investment      
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY      
Basis differentials $ 28,966 $ 36,336  
[1] During the year ended December 31, 2025, the joint ventures that own Safeco Plaza and Gateway Commons recognized property level impairment losses in accordance with ASC 360 (See Note 2). In prior periods, the Company had impaired its equity method investment to the estimated fair value for these joint ventures and therefore this is recognized as a basis difference.
[2] At December 31, 2025 and December 31, 2024, this amount included right of use assets - operating leases totaling approximately $17.9 million and $19.0 million, respectively.
[3] At December 31, 2025 and December 31, 2024, this amount included sales-type lease receivable, net totaling approximately $14.4 million and $14.1 million, respectively.
[4] At December 31, 2025 and December 31, 2024, this amount included lease liabilities - operating leases totaling approximately $30.5 million.
[5] This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, impairments at the property level, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. During the year ended December 31, 2025, the joint ventures that own Gateway Commons and Safeco Plaza recognized property level impairments of approximately $425.8 million and $319.5 million, respectively. During the year ended December 31, 2025, the Company recognized an other-than-temporary impairment loss on its investment in Gateway Commons of approximately $145.1 million. During the year ended December 31, 2024, the Company recognized an other-than-temporary impairment loss on its investments in Colorado Center, Gateway Commons and Safeco Plaza of approximately $168.4 million, $126.1 million, and $46.8 million, respectively. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. The Company’s basis differences include:
December 31, 2025December 31, 2024
Property(in thousands)
Colorado Center$131,356 $127,632 
200 Fifth Avenue48,289 49,656 
Gateway Commons(700)(74,500)
Safeco Plaza32,905 (75,576)
Dock 72(88,420)(92,054)
360 Park Avenue South(110,815)(113,265)
Platform 16(142,677)(142,698)
Other basis differentials28,966 36,336 
Total basis differentials $(101,096)$(284,469)
These basis differentials (excluding land, which does not depreciate) will be amortized over the remaining lives of the related assets and liabilities.
[6] Investments with deficit balances aggregating approximately $15.6 million and $33.5 million at December 31, 2025 and December 31, 2024, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
[7]
(3)During the year ended December 31, 2025, the joint ventures that own Safeco Plaza and Gateway Commons recognized property level impairment losses in accordance with ASC 360 (See Note 2). In prior periods, the Company had impaired
its equity method investment to the estimated fair value for these joint ventures and therefore this is recognized as a basis difference and does not impact Loss from Unconsolidated Joint Ventures on the Consolidated Statements of Operations.
[8] During the year ended December 31, 2025, the Company recognized an other-than-temporary impairment loss on its investment in Gateway Commons of approximately $145.1 million. During the year ended December 31, 2024, the Company recognized an other-than-temporary impairment loss on its investments in Colorado Center, Gateway Commons and Safeco Plaza of approximately $168.4 million, $126.1 million, and $46.8 million, respectively. During the year ended December 31, 2023, the Company recognized an other-than-temporary impairment loss on its investments in Platform 16, 360 Park Avenue South, 200 Fifth Avenue and Safeco Plaza of approximately $155.2 million, $54.0 million, $33.4 million and $29.9 million, respectively.
[9] 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.