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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes, Unsecured Revolving Credit Facility and Term Loan Facility (Details) - Kilroy Realty L.P. | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) extension_option | Dec. 31, 2023 USD ($) extension_option
Revolving Credit Facility and Term Loan Facility | Adjusted SOFR | Unsecured Revolving Credit Facility |  |
Terms of the Borrowing Facilities |  |
Variable rate (percent) | 0.10% | 0.10%
Revolving Credit Facility | Unsecured Revolving Credit Facility |  |
Terms of the Borrowing Facilities |  |
Outstanding borrowings | $ 0 | $ 0
Remaining borrowing capacity | 1,100,000,000 | 1,100,000,000
Total borrowing capacity | $ 1,100,000,000 | $ 1,100,000,000
Interest rate (percent) | 5.96% | 6.38%
Facility fee-annual rate (percent) | 0.20% | 0.20%
Outstanding letters of credit | $ 5,200,000 | $ 5,200,000
Contingent additional borrowings | $ 500,000,000.0 | $ 500,000,000.0
Reduction interest rate | 0.01% | 0.01%
Unamortized deferred financing costs | $ 13,600,000 | $ 3,200,000
Number of extension options | extension_option | 2 | 2
Extension period (in months) | 6 months | 6 months
Revolving Credit Facility | SOFR | Unsecured Revolving Credit Facility |  |
Terms of the Borrowing Facilities |  |
Variable rate (percent) | 0.90% | 0.90%
Term Loan Facility | 2022 Term Loan Facility |  |
Terms of the Borrowing Facilities |  |
Outstanding borrowings |  | $ 520,000,000
Remaining borrowing capacity |  | 0
Total borrowing capacity |  | $ 520,000,000
Interest rate (percent) |  | 6.41%
Facility fee-annual rate (percent) |  | 0.20%
Unamortized deferred financing costs |  | $ 2,300,000
Term Loan Facility | SOFR | 2024 Term Loan Facility |  |
Terms of the Borrowing Facilities |  |
Variable rate (percent) | 0.95% |
Term Loan Facility | SOFR | 2022 Term Loan Facility |  |
Terms of the Borrowing Facilities |  |
Variable rate (percent) | 0.95% | 0.95%
Unsecured debt, net | 2024 Term Loan Facility |  |
Terms of the Borrowing Facilities |  |
Number of extension options | extension_option | 2 |
Extension period (in months) | 12 months |
Line of Credit | 2024 Term Loan Facility |  |
Terms of the Borrowing Facilities |  |
Outstanding borrowings | $ 200,000,000 |
Remaining borrowing capacity | 0 |
Total borrowing capacity | $ 200,000,000 |
Interest rate (percent) | 6.16% |
Contingent additional borrowings | $ 130,000,000.0 |
Unamortized deferred financing costs | $ 1,600,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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