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Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Secured Debt    
Secured debt $ 242,938 $ 248,367
Kilroy Realty L.P.    
Secured Debt    
Long-term debt, gross 4,293,469  
Secured debt 242,938 248,367
Kilroy Realty L.P. | 3.57% Mortgage Payable due December 2026    
Secured Debt    
Long-term debt, gross 160,000  
Kilroy Realty L.P. | Secured debt    
Secured Debt    
Secured debt 243,469 249,023
Unamortized deferred financing costs (531) (656)
Total secured debt, net 242,938 248,367
Net book value of properties pledged as collateral for secured debt $ 205,000  
Kilroy Realty L.P. | Secured debt | 3.57% Mortgage Payable due December 2026    
Secured Debt    
Stated interest rate 3.57%  
Effective interest rate 3.57%  
Long-term debt, gross $ 159,973 163,435
Kilroy Realty L.P. | Secured debt | 4.48% Mortgage Payable due July 2027    
Secured Debt    
Stated interest rate 4.48%  
Effective interest rate 4.48%  
Long-term debt, gross $ 83,496 $ 85,588