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Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Secured Debt    
Secured debt $ 253,582 $ 258,593
Kilroy Realty L.P. [Member]    
Secured Debt    
Long-term debt, gross 3,954,365  
Secured debt 253,582 258,593
Unamortized Deferred Financing Costs (22,400)  
Kilroy Realty L.P. [Member] | Secured debt [Member]    
Secured Debt    
Secured debt 254,365 259,502
Unamortized Deferred Financing Costs (783) (909)
Long-term debt 253,582 258,593
Net book value of properties pledged as collateral for secured debt $ 222,000  
Kilroy Realty L.P. [Member] | Secured debt [Member] | 3.57% Mortgage Payable due December 2026 [Member]    
Secured Debt    
Stated interest rate 3.57%  
Effective interest rate 3.57%  
Long-term debt, gross $ 166,776 170,000
Kilroy Realty L.P. [Member] | Secured debt [Member] | 4.48% Mortgage Payable due July 2027 [Member]    
Secured Debt    
Stated interest rate 4.48%  
Effective interest rate 4.48%  
Long-term debt, gross $ 87,589 $ 89,502