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Consolidated and unconsolidated real estate joint ventures (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
ft²
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Equity Method Investments      
Reallocation of additional paid-in-capital to consolidated joint venture partner’s non-controlling interest $ 30,185 $ 0 $ 0
Purchase Price 248,699 $ 265,750 $ 2,877,861
Debt Balance, Repayment Amount From Unconsolidated Real Estate Joint Venture 100,000    
Our Share of Debt Balance, Repayment Amount From Unconsolidated Real Estate Joint Venture $ 10,000    
1655 and 1725 Third Street      
Schedule of Equity Method Investments      
Equity interest percentage (in percent) 10.00%    
Debt Refinanced, Amount $ 500,000    
1450 Research Boulevard      
Schedule of Equity Method Investments      
Equity interest percentage (in percent) 73.20%    
101 West Dickman Street      
Schedule of Equity Method Investments      
Equity interest percentage (in percent) 58.40%    
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      
Purchase Price $ 155,321    
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 1,000,000.0    
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      
Schedule of Equity Method Investments      
Reallocation of additional paid-in-capital to consolidated joint venture partner’s non-controlling interest $ 30,200    
1450 Owens Street | Alexandria      
Schedule of Equity Method Investments      
Noncontrolling interest, ownership percentage by parent 25.10% 40.60%  
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 48.20%    
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      
Schedule of Equity Method Investments      
Area of Real Estate Property | ft² 206,134    
Area of Real Estate, Tenant Occupied | ft² 115,839    
1201 and 1208 Eastlake Avenue East | Alexandria      
Schedule of Equity Method Investments      
Noncontrolling interest, ownership percentage by parent 30.00%    
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%    
Noncontrolling Interests | 1450 Owens Street | Alexandria      
Schedule of Equity Method Investments      
Ownership percentage by noncontrolling owners 75.00%    
Parent | 1450 Owens Street | Alexandria      
Schedule of Equity Method Investments      
Expected Subsidiary, Ownership Percentage, Parent 25.00%