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Consolidated and unconsolidated real estate joint ventures - Unconsolidated real estate joint ventures (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Oct. 26, 2026	Sep. 30, 2026	Dec. 31, 2025
Schedule of Equity Method Investments
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		$ 5,400
Investments in unconsolidated real estate joint ventures		$ 28,580	$ 30,677
Unconsolidated Real Estate Joint Ventures Debt
Interest Rate		4.33%
Debt Balance at 100%		$ 12,896,996
Fixed SOFR floor rate		0.75%
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Unconsolidated Real Estate Joint Ventures Debt
Debt instrument, borrowing capacity		$ 526,750
Debt Balance at 100%		516,492
1655 and 1725 Third Street
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures		$ 18,719	19,484
Equity Method Investment, Ownership Percentage		10.00%
Unconsolidated Real Estate Joint Ventures Debt
Maturity Date		Feb. 10, 2035
Stated interest rate (as a percent)		6.37%
Interest Rate		6.44%
Debt instrument, borrowing capacity		$ 500,000
Debt Balance at 100%		497,138
101 West Dickman Street
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures		$ 9,861	9,669
Equity Method Investment, Ownership Percentage		58.40%
Unconsolidated Real Estate Joint Ventures Debt
Maturity Date		Oct. 29, 2026
Applicable margin (as a percent)		1.95%
Interest Rate		5.91%
Debt instrument, borrowing capacity		$ 26,750
Debt Balance at 100%		19,354
101 West Dickman Street \| Subsequent Event
Unconsolidated Real Estate Joint Ventures Debt
Applicable margin (as a percent)	185.00%
Debt instrument, borrowing capacity	$ 22,500
Other unconsolidated real estate joint ventures
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures		$ 0	$ 1,524