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Investments in and Advances to Unconsolidated Joint Ventures - Schedule of Equity Method Investments (Details) $ in Thousands | Sep. 30, 2025 USD ($) property joint_venture | Dec. 31, 2024 USD ($) | Dec. 31, 2021
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and advances to unconsolidated joint ventures | $ 796,171 | $ 936,814 |
SWF SH JV | Other non-reportable |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 19 |  |
Investment ownership (as a percent) | 54.00% |  |
Equity method investment, amount | $ 312,093 | 322,551 |
South San Francisco JVs |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership (as a percent) | 30.00% |  |
South San Francisco JVs | Lab Buildings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 7 |  |
Investment ownership (as a percent) | 70.00% |  |
Equity method investment, amount | $ 285,044 | 446,145 |
Callan Ridge JV | Lab Buildings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 2 |  |
Investment ownership (as a percent) | 35.00% |  |
Equity method investment, amount | $ 75,069 | 69,709 |
HQ Point Preferred Equity Investment | Other non-reportable |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 2 |  |
Investment ownership (as a percent) | 33.00% |  |
Equity method investment, amount | $ 47,017 | 0 |
Lab JV | Lab Buildings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 1 |  |
Investment ownership (as a percent) | 49.00% |  |
Equity method investment, amount | $ 31,848 | 29,916 |
PMAK JV | Outpatient Medical |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 59 |  |
Investment ownership (as a percent) | 12.00% |  |
Equity method investment, amount | $ 24,229 | 32,511 |
Needham Land Parcel JV | Lab Buildings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 0 |  |
Investment ownership (as a percent) | 38.00% |  | 38.00%
Equity method investment, amount | $ 12,291 | 21,348 |
Outpatient Medical JVs |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated joint ventures (in joint ventures) | joint_venture | 2 |  |
Outpatient Medical JVs | Outpatient Medical |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 2 |  |
Equity method investment, amount | $ 7,328 | 7,199 |
Outpatient Medical JVs | Outpatient Medical | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership (as a percent) | 20.00% |  |
Outpatient Medical JVs | Outpatient Medical | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership (as a percent) | 67.00% |  |
HCP Ventures IV, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership (as a percent) | 20.00% |  |
Suburban Properties, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership (as a percent) | 67.00% |  |
Davis JV | Outpatient Medical |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Property count | property | 17 |  |
Investment ownership (as a percent) | 47.00% |  |
Equity method investment, amount | $ 1,252 | $ 7,435 |

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