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Debt (Narrative) (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2026 USD ($) | Mar. 10, 2026 USD ($) | Feb. 09, 2026 USD ($) ft² | Feb. 08, 2026 USD ($) | Feb. 04, 2026 USD ($) | Jan. 14, 2026 USD ($) | Jan. 07, 2026 USD ($) credit_facility | Jan. 06, 2026 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) | Dec. 10, 2025 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Number of revolving credit facilities | credit_facility |  |  |  |  |  |  | 2 |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  | $ 1,415,569 | $ 1,278,232 |  |
Long term debt |  |  |  |  |  |  |  |  | $ 2,599,970 |  | $ 2,264,959 |
Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  | 5.14% |  |  |
Mortgages payable | 350 Park Avenue | Kenneth C. Griffin (KG) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Debt amount |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  |  |  |  | $ 1,105,000 |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,130,000 |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.01% |  |  |  |  |  |  |
Facility fee (as a percent) |  |  |  |  | 0.24% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility, Maturing December 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,250,000 |  |  |  |  |  |  |
Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,000,000 | $ 915,000 |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.16% |  |  |  |  |
Facility fee (as a percent) |  |  |  |  |  |  | 0.24% |  |  |  |  |
Unsecured term loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  |  |  |  | $ 850,000 | $ 800,000 |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.15% | 1.25% |  |  |  |
Senior Unsecured Notes Due 2033 | Unsecured term loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Stated rate (in percent) |  |  |  |  |  | 5.75% |  |  |  |  |  |
Face amount, percent |  |  |  |  |  | 99.824% |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 5.78% |  |  |  |  |  |
Proceeds from debt |  |  |  |  |  | $ 494,000 |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 400,000 |  |  |  |  |  |
One Park Avenue mortgage loan | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.78% |  |  |  |  |  |  |  |  |
One Park Avenue Mortgage Loan due March 2026 | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.22% |  |  |  |  |  |  |  |
350 Park Avenue | Kenneth C. Griffin (KG) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes Due 2026 | Unsecured term loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Stated rate (in percent) | 2.15% |  |  |  |  |  |  |  |  |  |  |
Repaid of loan | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
One Park Avenue |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Loan balance |  |  | $ 525,000 | $ 525,000 |  |  |  |  |  |  |  |
Square footage of real estate property (in sqft) | ft² |  |  | 945 |  |  |  |  |  |  |  |  |
350 Park Avenue | Kenneth C. Griffin (KG) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.00% |  |  |  |  |  |  |  |  |  |
Net rent per annum |  | $ 16,000 |  |  |  |  |  |  |  |  |  |
Office | 888 Seventh Avenue |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  |  |  |  |  |  |  |  |  | $ 244,543
Office | One Park Avenue |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  | 5 years |  |  |  |  |  |  |  |  |

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