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Consolidated and unconsolidated real estate joint ventures (Details) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023 USD ($) ft²	Jun. 30, 2023 USD ($) ft²	Mar. 31, 2023 USD ($) ft²	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2022 USD ($)	Oct. 23, 2023	Apr. 11, 2023
Schedule of Equity Method Investments
Area of real estate property | ft²	75,100,000				75,100,000
Proceeds from Noncontrolling Interests					$ 436,207	$ 1,463,454
Contributions from and sales of noncontrolling interests	$ 136,726			$ 450,913	431,393	1,479,520
Payments to acquire real estate					257,333	2,499,772
Contribution of assets from real estate joint venture partner					$ 33,250	19,146
Future Development
Schedule of Equity Method Investments
Area of real estate property | ft²	0	374,349	715,000		0
Noncontrolling Interests
Schedule of Equity Method Investments
Contributions from and sales of noncontrolling interests	$ 130,271			324,957	$ 400,993	826,929
Redeemable Noncontrolling Interests
Schedule of Equity Method Investments
Contributions from and sales of noncontrolling interests	0			0	35,250	0
Additional Paid-In Capital
Schedule of Equity Method Investments
Contributions from and sales of noncontrolling interests	$ 6,455			$ 125,956	$ 30,400	$ 652,591
1655 and 1725 Third Street
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage	10.00%				10.00%
1401/1413 Research Boulevard
Schedule of Equity Method Investments
Equity Method Investment, Ownership Percentage	65.00%				65.00%
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	57.90%				57.90%
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%
99 Coolidge Avenue | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	75.00%				75.00%
15 Necco Street
Schedule of Equity Method Investments
Area of real estate property | ft²		345,995
Proceeds from Noncontrolling Interests		$ 66,108
15 Necco Street | Additional Paid-In Capital
Schedule of Equity Method Investments
Contributions from and sales of noncontrolling interests		$ (7,761)
15 Necco Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	60.30%		90.00%		60.30%			72.00%
15 Necco Street | Alexandria | Forecast
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent							57.00%
15 Necco Street | Alexandria | Noncontrolling Interests
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners			10.00%
Real Estate Property, Ownership Interest Sold		18.00%
15 Necco Street | Alexandria | Noncontrolling Interests | Existing Partner
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners								8.00%
Real Estate Property, Ownership Interest Sold by Noncontrolling Interests		2.00%
15 Necco Street | Alexandria | Noncontrolling Interests | New Partner
Schedule of Equity Method Investments
Real Estate Properties, Ownership Interest Acquired by Noncontrolling Interest		20.00%
15 Necco Street | Alexandria | Noncontrolling Interests | New Partner | Minimum
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners								20.00%
15 Necco Street | Alexandria | Noncontrolling Interests | New Partner | Maximum
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners		37.00%
Other joint venture
Schedule of Equity Method Investments
Payments to acquire real estate			$ 58,900
Total Value of Assets Acquired			37,600
Contribution of assets from real estate joint venture partner			$ 33,300
Other joint venture | Future Development
Schedule of Equity Method Investments
Area of real estate property | ft²			715,000
Other joint venture | Development Entitlements Acquired
Schedule of Equity Method Investments
Area of real estate property | ft²			515,000
Other joint venture | Redeemable Noncontrolling Interests
Schedule of Equity Method Investments
Contributions from and sales of noncontrolling interests			$ 35,300
Other joint venture | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	61.00%				61.00%
Other joint venture | Alexandria | Noncontrolling Interests
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners	39.00%				39.00%
Alexandria Center for Science and Technology - Mission Bay | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	25.00%				25.00%
1450 Owens Street | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	42.80%				42.80%
1450 Owens Street | Alexandria | Noncontrolling Interests
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners	75.00%				75.00%
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	46.70%				46.70%
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
Schedule of Equity Method Investments
Area of real estate property | ft²		163,648
Proceeds from Noncontrolling Interests		$ 32,261
Noncontrolling Interest, Consideration Transferred		160,500
9625 Towne Centre Drive | Additional Paid-In Capital
Schedule of Equity Method Investments
Contributions from and sales of noncontrolling interests		$ 15,553
9625 Towne Centre Drive | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	30.00%		50.10%		30.00%
9625 Towne Centre Drive | Alexandria | Noncontrolling Interests
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners			49.90%
Real Estate Property, Ownership Interest Sold		20.10%
9625 Towne Centre Drive | Alexandria | Noncontrolling Interests | Previous Partner
Schedule of Equity Method Investments
Real Estate Property, Ownership Interest Sold by Noncontrolling Interests		49.90%
9625 Towne Centre Drive | Alexandria | Noncontrolling Interests | New Partner
Schedule of Equity Method Investments
Ownership percentage by noncontrolling owners		70.00%
SD Tech by Alexandria | Alexandria
Schedule of Equity Method Investments
Noncontrolling Interest, Ownership Percentage by Parent	50.00%				50.00%
Pacific Technology Park | 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 and 199 East Blaine Street | 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%

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