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Investments in real estate - Dispositions (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2025 USD ($) | Aug. 31, 2025 USD ($) ft² | Sep. 30, 2025 USD ($) ft² property | Jun. 30, 2025 USD ($) ft² property | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) ft² property | Sep. 30, 2024 USD ($)
Real Estate Properties |  |  |  |  |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  | $ 227,105 | $ 229,790
Noncash, Disposition of our interest in Pacific Technology Park |  |  |  |  |  |  | 82,392 | 0
Gain on sales of real estate |  |  | $ 9,366 |  |  | $ 27,114 | 22,531 | 27,506
Noncash, Acquisition of our partner’s noncontrolling interest in 199 East Blaine Street |  |  |  |  |  |  | 96,543 | 0
Impairment of real estate |  |  | $ 323,870 |  |  | $ 5,741 | $ 485,630 | $ 36,504
North America |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 39,100,000 |  |  |  | 39,100,000 |
Proceeds from sales of real estate |  |  |  |  |  |  | $ 436,871 |
Gain on sales of real estate |  |  |  |  |  |  | $ 22,531 |
Number of real estate properties | property |  |  | 375 |  |  |  | 375 |
San Francisco Bay Area |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  | $ 32,200 |  |  |
Costa Verde and Scripps Science Park |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Real Estate Property, Ownership Interest Sold |  |  | 100.00% |  |  |  | 100.00% |
Proceeds from sales of real estate |  |  |  |  |  |  | $ 124,000 |
Gain on sales of real estate |  |  |  |  |  |  | $ 0 |
Costa Verde and Scripps Science Park | Notes Receivable |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent |  |  |  |  | $ 91,000 |  |  |
Costa Verde and Scripps Science Park | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 8,730 |  |  |  | 8,730 |
Costa Verde and Scripps Science Park | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 537,000 |  |  |  | 537,000 |
Pacific Technology Park |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Noncash, Disposition of our interest in Pacific Technology Park |  |  |  |  |  |  | $ 96,000 |
Gain on sales of real estate |  |  | $ 9,300 |  |  |  | $ 9,290 |
Number of real estate properties | property |  |  |  | 5 |  |  |  |
Pacific Technology Park | Alexandria |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 50.00% | 50.00% |  |  | 50.00% |
Pacific Technology Park | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 544,352 |  |  |  | 544,352 |
Pacific Technology Park | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 0 |  |  |  | 0 |
5505 Morehouse Drive |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Real Estate Property, Ownership Interest Sold |  |  | 100.00% |  |  |  | 100.00% |
Proceeds from sales of real estate |  | $ 45,000 |  |  |  |  |  |
Gain on sales of real estate |  | $ 0 |  |  |  |  |  |
5505 Morehouse Drive | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  | 79,945 |  |  |  |  |  |
5505 Morehouse Drive | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 0 |  |  |  | 0 |
2425 Garcia Avenue and 2400/2450 Bayshore Parkway |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Real Estate Property, Ownership Interest Sold |  |  | 100.00% |  |  |  | 100.00% |
Proceeds from sales of real estate |  |  |  |  |  |  | $ 11,000 |
Gain on sales of real estate |  |  |  |  |  |  | $ 0 |
2425 Garcia Avenue and 2400/2450 Bayshore Parkway | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 95,901 |  |  |  | 95,901 |
2425 Garcia Avenue and 2400/2450 Bayshore Parkway | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 0 |  |  |  | 0 |
Other - Texas |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Real Estate Property, Ownership Interest Sold |  |  | 100.00% |  |  |  | 100.00% |
Proceeds from sales of real estate |  |  |  |  |  |  | $ 73,287 |
Gain on sales of real estate |  |  |  |  |  |  | $ 0 |
Other - Texas | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 0 |  |  |  | 0 |
Other - Texas | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 1,350,000 |  |  |  | 1,350,000 |
Other markets |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  | $ 87,584 |
Gain on sales of real estate |  |  |  |  |  |  | 13,241 |
199 East Blaine Street |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 115,084 |  |  |  |
Noncash, Acquisition of our partner’s noncontrolling interest in 199 East Blaine Street |  |  |  |  |  |  | $ 94,400 |
199 East Blaine Street | Alexandria |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 100.00% | 30.00% |  |  | 100.00% |
30-02 48th Avenue |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  |  | $ 206,200 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | $ 31,100 |
Building occupancy |  |  | 52.00% |  |  |  | 52.00% |
30-02 48th Avenue | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 179,100 |  |  |  | 179,100 |
550 Arsenal Street |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  |  | $ 43,400 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | $ 96,300 |
550 Arsenal Street | Subsequent Event |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Proceeds from sales of real estate | $ 99,300 |  |  |  |  |  |  |
Gain on sales of real estate | $ 0 |  |  |  |  |  |  |
550 Arsenal Street | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 249,275 |  |  |  | 249,275 |
550 Arsenal Street | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 281,592 |  |  |  | 281,592 |
Other - Other Market |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Gain on sales of real estate |  |  |  |  |  |  | $ 0 |
Impairment of real estate |  |  |  |  |  |  | 47,300 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | $ 28,900 |
Other - Other Market | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 374,349 |  |  |  | 374,349 |
5600 Avenida Encinas |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 182,276 |  |  |  | 182,276 |
Impairment of real estate |  |  | $ 7,300 | $ 35,400 |  |  | $ 42,800 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | 61,800 |
7 Triangle Drive |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  |  | 31,800 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | $ 1,200 |
Number of real estate properties | property |  |  | 1 |  |  |  | 1 |
7 Triangle Drive | Operating Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 104,531 |  |  |  | 104,531 |
10256 and 10260 Meanley Drive |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  |  | $ 27,800 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | $ 13,900 |
10256 and 10260 Meanley Drive | Future Development Projects |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 154,308 |  |  |  | 154,308 |
6260 Sequence Drive and 5505 Morehouse Drive |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 210,481 |  |  |  | 210,481 |
Impairment of real estate |  |  |  |  |  |  | $ 17,300 |
Potential Asset Disposition, Consideration |  |  |  |  |  |  | $ 112,300 |
Number of real estate properties | property |  |  | 2 |  |  |  | 2 |

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