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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 17, 2025 | Aug. 07, 2025 | Jan. 08, 2024 | Dec. 14, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 3,482,279 |  | $ 3,407,719 | $ 3,273,569 |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Transaction costs |  | 2,678 |  | 1,597 | 4,313 |  |  |  |  |
Depreciation and amortization |  | 912,088 |  | 887,191 | 830,813 |  |  |  |  |
Total expenses |  | 2,470,606 |  | 2,387,385 | 2,239,227 |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Loss from early extinguishment of debt |  | (338) |  | 0 | 0 |  |  |  |  |
Interest expense |  | (653,138) |  | (645,117) | (579,572) |  |  |  |  |
Gain on sales type lease |  | (2,490) |  | 0 | 0 |  |  |  |  |
Gains on sales of real estate |  | 176,732 |  | 602 | 517 |  |  |  |  |
Impairment loss |  | (85,803) |  | (13,615) | 0 |  |  |  |  |
Net income |  | 383,995 |  | 84,188 | 291,424 |  |  |  |  |
Loss from unconsolidated joint ventures |  | (103,560) |  | (343,177) | (239,543) |  |  |  |  |
Straight Line Rent Adjustments |  | 107,100 |  | 105,600 | 99,100 |  |  |  |  |
Above and below market rent adjustments, net |  | $ 7,700 |  | 5,500 | 19,200 |  |  |  |  |
Rosecrans-Sepulveda Partners 4, LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 50.00% | [1] |  |  |  | 50.00% |  |  |
Gateway Commons Complex [Member] |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  | $ (145,100) |  | (126,100) |  |  |  |  |  |
Ownership Percentage | [2] | 50.00% |  |  |  |  |  |  |  |
CA-Colorado Center LLC[Member] |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  | (168,400) |  |  |  |  |  |
Ownership Percentage |  | 50.00% |  |  |  |  |  |  |  |
Safeco Plaza REIT LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  | (46,800) |  |  |  |  |  |
Ownership Percentage | [3] | 33.67% |  |  |  |  |  |  |  |
Platform 16 |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 55.00% |  |  |  |  |  |  |  |
360 PAS Holdco LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 71.11% | [4] |  |  |  |  | 71.11% |  |
200 Fifth Avenue JV LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 26.69% |  |  |  |  |  |  |  |
Joint Venture Partner [Member] | Santa Monica Business Park [Member] |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  |  |  | 45.00%
Joint Venture Partner [Member] | Unconsolidated Properties | 901 New York Avenue LLC [Member] | 901 New York Avenue |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  |  | 50.00% |
Company's Share [Member] | Safeco Plaza REIT LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 33.00% |  |  |  |  |  |  |  |
Company's Share [Member] | 360 PAS Holdco LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 35.79% |  |  |  |  |  |  |  |
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue | [5] | $ 507,979 |  | 507,678 | 612,589 |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Operating |  | 223,067 |  | 204,625 | 239,947 |  |  |  |  |
Transaction costs |  | 233 |  | 456 | 301 |  |  |  |  |
Depreciation and amortization |  | 173,310 |  | 160,756 | 197,228 |  |  |  |  |
Total expenses |  | 396,610 |  | 365,837 | 437,476 |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Loss from early extinguishment of debt |  | (171) |  | 0 | (3) |  |  |  |  |
Interest expense |  | (172,915) |  | (176,994) | (227,537) |  |  |  |  |
Unrealized gain (loss) on derivative instruments |  | (14,351) |  | 5,570 | (6,582) |  |  |  |  |
Gain on sales type lease |  | 0 |  | 0 | 2,737 |  |  |  |  |
Gains on sales of real estate |  | 72,818 | [6] | 0 | 0 |  |  |  |  |
Impairment loss |  | (745,224) | [7] | 0 | 0 |  |  |  |  |
Net income |  | (748,474) |  | (29,583) | (56,272) |  |  |  |  |
Company's share of net income (loss) |  | (312,810) |  | (10,912) | (19,599) |  |  |  |  |
Gain on Unconsolidated Joint Venture Investment |  | 0 |  | 0 | 35,756 | [8] |  |  |  |
Gain on sale / consolidation | [9] | 24,261 |  | 21,696 | 28,412 |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment | [10] | (145,133) |  | (341,338) | (272,603) |  |  |  |  |
Basis differential | [11] | 330,122 | [7] | (12,623) | (11,509) |  |  |  |  |
Loss from unconsolidated joint ventures |  | (103,560) |  | (343,177) | (239,543) |  |  |  |  |
Straight Line Rent Adjustments |  | 12,100 |  | 13,700 | 28,700 |  |  |  |  |
Unconsolidated Joint Ventures [Member] | Safeco Plaza REIT LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  |  | (29,900) |  |  |  |  |
Unconsolidated Joint Ventures [Member] | Platform 16 |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  |  | (155,200) |  |  |  |  |
Unconsolidated Joint Ventures [Member] | 360 PAS Holdco LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  |  | (54,000) |  |  |  |  |
Unconsolidated Joint Ventures [Member] | 200 Fifth Avenue JV LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  |  | (33,400) |  |  |  |  |
Unconsolidated Joint Ventures [Member] | Basis Differential |  |  |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | (11,800) |  | 15,400 | 16,600 |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivative instruments |  | $ 3,800 |  | (1,500) | $ 1,800 |  |  |  |  |
Unconsolidated Joint Ventures [Member] | Unconsolidated Properties | Gateway Commons Complex [Member] |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  | (126,100) |  |  |  |  |  |
Unconsolidated Joint Ventures [Member] | Unconsolidated Properties | CA-Colorado Center LLC[Member] |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  | (168,400) |  |  |  |  |  |
Unconsolidated Joint Ventures [Member] | Unconsolidated Properties | Safeco Plaza REIT LLC |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other-than-Temporary Impairment |  |  |  | $ (46,800) |  |  |  |  |  |
[1] | On September 17, 2025, the joint venture completed the sale of the land parcel.
[2] | 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).
[3] | 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.
[4] | 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.
[5] | Includes straight-line rent adjustments of approximately $12.1 million, $13.7 million and $28.7 million for the years ended December 31, 2025, 2024 and 2023, respectively.
[6] | During the year ended December 31, 2025, gains on sales of real estate included Beach Cities Media Campus and 751 Gateway.
[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, 2023, the Company completed a restructuring of its ownership in Metropolitan Square.
[9] | During the year ended December 31, 2025, the Company completed the sale of its investment in Market Square North. During the year ended December 31, 2024, the Company acquired its joint venture partner’s 50% economic interest in 901 New York Avenue. During the year ended December 31, 2023, the Company acquired its joint venture partner’s 45% ownership interest in Santa Monica Business Park.
[10] | 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.
[11] | Includes depreciation and amortization of approximately $(11.8) million, $15.4 million and $16.6 million for the years ended December 31, 2025, 2024 and 2023, respectively. Includes unrealized gain (loss) on derivative instruments of approximately $(3.8) million, $1.5 million and $(1.8) million for the years ended December 31, 2025, 2024 and 2023, respectively.

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