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Secured and Unsecured Debt of the Operating Partnership - Secured Debt and Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Secured Debt |  |
Total secured debt | $ 598,199 | $ 603,225
Kilroy Realty L.P. |  |
Secured Debt |  |
Long-term debt, gross | 4,631,688 |
Total secured debt | 598,199 | 603,225
Kilroy Realty L.P. | 3.57% Mortgage Payable due December 2026 |  |
Secured Debt |  |
Long-term debt, gross | 152,700 |
Kilroy Realty L.P. | 5.90% Mortgage Payable due August 2034 |  |
Secured Debt |  |
Long-term debt, gross | 375,000 |
Kilroy Realty L.P. | Secured debt |  |
Secured Debt |  |
Total secured debt | 606,688 | 612,694
Unamortized deferred financing costs | (8,489) | (9,469)
Total secured debt, net | $ 598,199 | 603,225
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 | $ 152,668 | 156,386
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 | $ 79,020 | 81,308
Kilroy Realty L.P. | Secured debt | 5.90% Mortgage Payable due August 2034 |  |
Secured Debt |  |
Stated interest rate | 5.90% |
Effective interest rate | 5.90% |
Long-term debt, gross | $ 375,000 | $ 375,000

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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