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Area of a real estate property.

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Consolidated and unconsolidated real estate joint ventures (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jul. 31, 2025 USD ($)	Jun. 30, 2025 ft² property
Schedule of Equity Method Investments
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
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		48,710		48,710	250
Proceeds from sales of real estate				227,105	229,790
Payments to noncontrolling interests				204,543	231,072
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		241,924	59,000	372,188	194,871
Greater Boston
Schedule of Equity Method Investments
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures	$ 10,400
Additional Paid-In Capital
Schedule of Equity Method Investments
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		66,317	0	73,365	8,084
Noncontrolling Interests
Schedule of Equity Method Investments
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		48,710		48,710	250
Payments to noncontrolling interests				186,800	179,100
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		$ 175,607	$ 59,000	$ 298,823	$ 186,787
Noncontrolling Interests \| Greater Boston
Schedule of Equity Method Investments
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ 7,000
1655 and 1725 Third Street
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		10.00%		10.00%
1450 Research Boulevard
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		73.20%		73.20%
101 West Dickman Street
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		58.40%		58.40%
50 and 60 Binney Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		34.00%		34.00%
75/125 Binney Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		40.00%		40.00%
100 and 225 Binney Street and 300 Third Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
15 Necco Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		56.70%		56.70%
285, 299, 307, and 345 Dorchester Avenue \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		60.00%		60.00%
Alexandria Center for Science and Technology - Mission Bay \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		25.00%		25.00%
601, 611, 651, 681, 685, and 701 Gateway Boulevard \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		50.00%		50.00%
751 Gateway Boulevard \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		51.00%		51.00%
211 and 213 East Grand Avenue \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
500 Forbes Boulevard \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		10.00%		10.00%
Alexandria Center® for Life Science – Millbrae \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		48.50%		48.50%
3215 Merryfield Row \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
Campus Point by Alexandria \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		55.00%		55.00%
5200 Illumina Way \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		51.00%		51.00%
9625 Towne Centre Drive \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
SD Tech by Alexandria \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		50.00%		50.00%
Summers Ridge Science Park \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
1201 and 1208 Eastlake Avenue East \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
400 Dexter Avenue North \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%		30.00%
800 Mercer Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		60.00%		60.00%
99 Coolidge Avenue
Schedule of Equity Method Investments
Noncontrolling Interest in Joint Ventures						$ 42,000
Redeemable Noncontrolling Interest, Equity, Fair Value		$ 48,700		$ 48,700
Redeemable Noncontrolling Interest, Accretion Rate		4.05%		4.05%
Redeemable Noncontrolling Interest, Equity, Accrued Distribution		$ 340		$ 340
99 Coolidge Avenue \| Additional Paid-In Capital
Schedule of Equity Method Investments
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		6,700
Pacific Technology Park
Schedule of Equity Method Investments
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		96,000
Number of real estate properties \| property							5
Gain on sales of real estate		9,300		9,290
Noncontrolling Interest In Joint Ventures, Derecognized		$ 82,400		$ 82,400
Pacific Technology Park \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		50.00%		50.00%			50.00%
Subsidiary, Ownership Percentage, Noncontrolling Owner							50.00%
199 East Blaine Street
Schedule of Equity Method Investments
Noncontrolling Interest in Joint Ventures		$ 30,300		$ 30,300
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 \| Additional Paid-In Capital
Schedule of Equity Method Investments
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		$ 66,300
199 East Blaine Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		100.00%		100.00%			30.00%
Subsidiary, Ownership Percentage, Noncontrolling Owner							70.00%
Pacific Technology Park and 199 East Blaine Street
Schedule of Equity Method Investments
Proceeds from sales of real estate		$ 1,600