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Consolidated and unconsolidated real estate joint ventures (Details)
Sep. 30, 2019
75/125 Binney Street  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 40.00%
225 Binney Street  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 30.00%
409/499 Illinois Street  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 60.00%
1500 Owens Street  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 50.10%
500 Forbes Boulevard  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 10.00%
Campus Pointe by Alexandria  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 55.00%
5200 Illumina Way  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 51.00%
9625 Towne Centre Drive  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 50.10%
Equity Method Investee | Menlo Gateway  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 48.30%
Equity Method Investee | 1401/1413 Research Boulevard  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 65.00%
Equity Method Investee | 704 Quince Orchard Road  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 56.80%
Equity Method Investee | 1655 and 1725 Third Street  
Schedule of Equity Method Investments  
Our ownership percentage (in percent) 10.00%