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Consolidated and unconsolidated real estate joint ventures (Details) $ in Thousands, ft² in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2024 USD ($) ft²	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023
Schedule of Equity Method Investments
Reallocation of additional paid-in-capital to consolidated joint venture partner’s non-controlling interest		$ 30,185	$ 0
Payments to acquire real estate		$ 201,049	$ 233,317
1655 and 1725 Third Street
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		10.00%
1401/1413 Research Boulevard
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		65.00%
1450 Research Boulevard
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		73.20%
101 West Dickman Street
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage		58.20%
50 and 60 Binney Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		34.00%
75/125 Binney Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		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%
99 Coolidge Avenue | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		75.00%
15 Necco Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		56.70%
285, 299, 307, and 345 Dorchester Avenue
Schedule of Equity Method Investments
Payments to acquire real estate	$ 155,300
Total Value of Assets Acquired	$ 103,500
285, 299, 307, and 345 Dorchester Avenue | Future development projects
Schedule of Equity Method Investments
Area of real estate property | ft²	1.0
285, 299, 307, and 345 Dorchester Avenue | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		60.00%
Alexandria Center for Science and Technology - Mission Bay | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		25.00%
1450 Owens Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		26.30%		40.60%
1450 Owens Street | Alexandria | Noncontrolling Interests
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners		75.00%
1450 Owens Street | Alexandria | Parent
Schedule of Equity Method Investments
Expected Subsidiary, Ownership Percentage, Parent		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%
751 Gateway Boulevard | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		51.00%
211 and 213 East Grand Avenue | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%
500 Forbes Boulevard | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		10.00%
Alexandria Center® for Life Science – Millbrae | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		47.70%
3215 Merryfield Row | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%
Campus Point by Alexandria | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		55.00%
5200 Illumina Way | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		51.00%
9625 Towne Centre Drive | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%
SD Tech by Alexandria | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		50.00%
Pacific Technology Park | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		50.00%
Summers Ridge Science Park | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%
1201 and 1208 Eastlake Avenue East and 199 East Blaine Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%
400 Dexter Avenue North | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		30.00%
800 Mercer Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent		60.00%

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