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Leases - Lessee (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
property
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
property
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Lessee, Lease, Description [Line Items]          
Operating lease liability $ 361,986   $ 361,986   $ 507,127
Operating lease right-of-use assets $ 713,433   $ 713,433   764,472
Operating lease discount rate 4.70%   4.70%    
Number of properties subject to ground leases | property 31   31    
Percentage of properties subject to ground leases 8.00%   8.00%    
Operating lease costs - cash rents     $ 165,200 $ 24,700  
Remaining lease term for operating lease obligations     11 years    
Impairment of real estate $ 323,870 $ 5,741 $ 485,630 36,504  
Operating Lease Liabilities, Payments Due          
2025 5,389   5,389    
2026 22,768   22,768    
2027 21,849   21,849    
2028 21,517   21,517    
2029 21,025   21,025    
Thereafter 686,239   686,239    
Total future payments under our operating leases in which we are the lessee 778,787   778,787    
Effect of discounting (416,801)   (416,801)    
Operating lease liability 361,986   361,986   $ 507,127
Leasee operating costs          
Gross operating lease costs 11,525 10,701 36,743 29,842  
Capitalized lease costs (880) (521) (2,293) (1,567)  
Expenses for operating leases in which we are the lessee $ 10,645 $ 10,180 34,450 $ 28,275  
Alexandria Technology Square          
Lessee, Lease, Description [Line Items]          
Operating lease costs - cash rents     $ 135,000    
Minimum          
Lessee, Lease, Description [Line Items]          
Remaining lease term for ground lease obligation     29 years    
Maximum          
Lessee, Lease, Description [Line Items]          
Remaining lease term for ground lease obligation     81 years    
Ground and operating leases          
Lessee, Lease, Description [Line Items]          
Weighted average remaining lease term 54 years   54 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 $ 5,200   $ 5,200