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Consolidated and unconsolidated real estate joint ventures - Unconsolidated real estate joint ventures (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Schedule of Equity Method Investments
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 6,700
Investments in unconsolidated real estate joint ventures	$ 39,601		$ 39,873
Debt Balance, Repayment Amount From Unconsolidated Real Estate Joint Venture		$ 100,000
Our Share of Debt Balance, Repayment Amount From Unconsolidated Real Estate Joint Venture		10,800
Unconsolidated Real Estate Joint Ventures Debt
Interest Rate	3.97%
Debt Balance at 100%	$ 13,593,541
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	$ 539,750
Debt Balance at 100%	524,725
1655 and 1725 Third Street
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 19,904		10,574
Equity Method Investment, Ownership Percentage	10.00%
Debt Refinanced, Amount		500,000
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	$ 600,000
Debt Balance at 100%	496,794
1450 Research Boulevard
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 8,355		9,193
Equity Method Investment, Ownership Percentage	73.20%
Unconsolidated Real Estate Joint Ventures Debt
Maturity Date	Dec. 06, 2026
Applicable margin (as a percent)	1.95%
Interest Rate	6.26%
Debt instrument, borrowing capacity	$ 13,000
Debt Balance at 100%	8,932
101 West Dickman Street
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 9,717		9,749
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	6.20%
Debt instrument, borrowing capacity	$ 26,750
Debt Balance at 100%	18,999
Other unconsolidated real estate joint ventures
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 1,625		$ 10,357

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