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Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Secured Debt |  |
Total secured debt | $ 248,367 | $ 253,582
Kilroy Realty L.P. |  |
Secured Debt |  |
Long-term debt, gross | 4,099,023 |
Total secured debt | 248,367 | 253,582
Kilroy Realty L.P. | Secured debt |  |
Secured Debt |  |
Total secured debt | 249,023 | 254,365
Unamortized deferred financing costs | (656) | (783)
Total secured debt, net | 248,367 | 253,582
Net book value of properties pledged as collateral for secured debt | $ 212,000 |
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 | $ 163,435 | 166,776
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 | $ 85,588 | $ 87,589

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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