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Leases Lessee (Details)
$ in Thousands, ft² in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
ft²
property
Mar. 31, 2024
USD ($)
property
Jun. 30, 2024
Dec. 31, 2024
USD ($)
ft²
property
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Lessee, Lease, Description [Line Items]            
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets     Other assets Other assets  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Accounts payable, accrued expenses, and other liabilities     Accounts payable, accrued expenses, and other liabilities Accounts payable, accrued expenses, and other liabilities  
Operating lease liability $ 507,127     $ 507,127 $ 382,883  
Operating lease right-of-use assets $ 764,472     $ 764,472 516,452  
Operating lease discount rate 4.90%     4.90%    
Operating lease costs - cash rents       $ 167,800 32,200 $ 55,200
Number of Properties Subject to Ground Leases | property 32     32    
Percentage of Properties Subject to Ground Leases 8.00%     8.00%    
Remaining lease term for operating lease obligations       12 years    
Operating Lease Liabilities, Payment Due            
2025 $ 157,887     $ 157,887    
2026 23,081     23,081    
2027 22,162     22,162    
2028 21,830     21,830    
2029 21,338     21,338    
Thereafter 703,148     703,148    
Total future payments under our operating leases in which we are the lessee 949,446     949,446    
Effect of discounting (442,319)     (442,319)    
Operating lease liability 507,127     507,127 382,883  
Lessee operating costs            
Gross operating lease costs       40,740 39,879 36,527
Capitalized lease costs       (1,780) (5,544) (3,661)
Expenses for operating leases in which we are lessee       38,960 $ 34,335 $ 32,866
Alexandria Technology Square            
Lessee, Lease, Description [Line Items]            
Operating lease liability $ 134,300     $ 134,300    
Area of Real Estate Property | ft² 1.2     1.2    
Ground Lease Contractual Term Extension, Years       24 years    
Lease Expiration Date Dec. 31, 2088   Jan. 01, 2065      
Prepaid Rent $ 270,000     $ 270,000    
Operating lease costs - cash rents 135,000          
Operating Lease Liabilities, Payment Due            
Operating lease liability $ 134,300     $ 134,300    
San Francisco Bay Area            
Lessee, Lease, Description [Line Items]            
Operating lease costs - cash rents   $ 26,300        
Number of properties associated with lease extensions executed | property   2        
Minimum            
Lessee, Lease, Description [Line Items]            
Remaining lease term for ground lease obligation       30 years    
Maximum            
Lessee, Lease, Description [Line Items]            
Remaining lease term for ground lease obligation       82 years    
Ground and Operating Leases            
Lessee, Lease, Description [Line Items]            
Weighted average remaining lease term 56 years     56 years    
Operating Property With Ground Lease            
Lessee, Lease, Description [Line Items]            
Number of Properties Subject to Ground Leases | property 1     1    
Net book value for the exclusion of one ground lease related to one operating property $ 5,600     $ 5,600