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Schedule III - Real Estate and Accumulated Depreciation - Narrative (Details) $ in Thousands | Dec. 31, 2024 USD ($) property | Dec. 31, 2023 USD ($)
--- | --- | ---
Real Estate and Accumulated Depreciation [Line Items] |  |
Investment in real estate, federal Income tax basis | $ 10,400,000 |
Kilroy Realty L.P. |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Long-term debt, gross | 4,631,688 |
Kilroy Realty L.P. | Secured debt |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Unamortized debt issuance expense | 8,489 | $ 9,469
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P. |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Long-term debt, gross | 152,700 |
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P. | Secured debt |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Long-term debt, gross | 152,668 | 156,386
4.48% Mortgage Payable due July 2027 | Kilroy Realty L.P. | Secured debt |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Long-term debt, gross | 79,020 | 81,308
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P. |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Long-term debt, gross | 375,000 |
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P. | Secured debt |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Long-term debt, gross | 375,000 | $ 375,000
Office Building |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Unamortized debt issuance expense | $ 8,500 |
Office Building | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Number of buildings | property | 5 |
Residential Tower | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Number of buildings | property | 1 |
Building |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Depreciation life | 35 years |
Tenant Improvements | Minimum |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Property depreciable lives | 1 year |
Tenant Improvements | Maximum |  |
Real Estate and Accumulated Depreciation [Line Items] |  |
Property depreciable lives | 20 years |

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