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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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