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Unconsolidated real estate joint ventures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 6,700
Investments in unconsolidated real estate joint ventures	39,873	$ 37,780
Gain on sales of real estate	$ 129,312	277,037	$ 537,918
Unconsolidated Real Estate Joint Venture Debt
Weighted Average Interest Rate at End of Period	3.86%
Long-term Debt	$ 12,244,374
1655 and 1725 Third Street
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 10,574	11,718
Unconsolidated Real Estate Joint Venture Debt
Maturity date	Mar. 10, 2025
Weighted Average Interest Rate at End of Period	4.57%
Debt instrument, borrowing capacity	$ 600,000
Long-term Debt	$ 599,930
Equity interest percentage (in percent)	10.00%
Stated interest rate (as a percent)	4.50%
101 West Dickman Street
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 9,749	9,290
Unconsolidated Real Estate Joint Venture Debt
Maturity date	Nov. 10, 2026
Debt Instrument, Basis Spread on Variable Rate	1.95%
Weighted Average Interest Rate at End of Period	6.36%
Debt instrument, borrowing capacity	$ 26,750
Long-term Debt	$ 18,884
Equity interest percentage (in percent)	58.40%
1450 Research Boulevard
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 9,193	6,041
Unconsolidated Real Estate Joint Venture Debt
Maturity date	Dec. 10, 2026
Debt Instrument, Basis Spread on Variable Rate	1.95%
Weighted Average Interest Rate at End of Period	6.42%
Debt instrument, borrowing capacity	$ 13,000
Long-term Debt	$ 8,637
Equity interest percentage (in percent)	73.20%
Other unconsolidated real estate joint ventures
Schedule of Equity Method Investments
Investments in unconsolidated real estate joint ventures	$ 10,357	$ 10,731
1401/1413 Research Boulevard
Schedule of Equity Method Investments
Equity Method Investment, Long-Term Debt Outstanding Amount	18,600
Gain on sales of real estate	$ 3,328
Unconsolidated Real Estate Joint Venture Debt
Equity interest percentage (in percent)	65.00%
Equity Method Investee
Unconsolidated Real Estate Joint Venture Debt
Debt instrument, borrowing capacity	$ 639,750
Long-term Debt	$ 627,451

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