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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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