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Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty L.P.
 9 Months Ended
Sep. 30, 2024
Debt Instrument [Line Items]  
Schedule of Unsecured Revolving Credit Facility
The following table summarizes the balance and terms of our unsecured revolving credit facility as of September 30, 2024 and December 31, 2023:
Unsecured Revolving Credit Facility
September 30, 2024December 31, 2023
(in thousands)
Outstanding borrowings$— $— 
Remaining borrowing capacity (1)
1,100,000 1,100,000 
Total borrowing capacity (1)
$1,100,000 $1,100,000 
Interest rate (2)
5.96 %6.38 %
Facility fee-annual rate (3)
0.200%
Maturity date (4)
July 31, 2028July 31, 2025
________________________
(1)Remaining and total borrowing capacity are further reduced by the amount of our outstanding letters of credit which total approximately $5.2 million as of September 30, 2024 and December 31, 2023. We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $500.0 million under an accordion feature pursuant to the terms of the unsecured revolving credit facility.
(2)Our unsecured revolving credit facility interest rate was calculated using the Secured Overnight Financing Rate (“SOFR”) plus a SOFR adjustment of 0.10% (“Adjusted SOFR”) and a margin of 0.900% based on our credit rating as of September 30, 2024 and December 31, 2023. We may be entitled to a temporary 0.01% reduction in the interest rate provided we meet certain sustainability goals with respect to the ongoing reduction of greenhouse gas emissions.
(3)Our facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs in connection with the amendment and restatement of the unsecured revolving credit facility. As of September 30, 2024 and December 31, 2023, $13.6 million and $3.2 million of unamortized deferred financing costs, respectively, which are included in prepaid expenses and other assets, net on our consolidated balance sheets, remained to be amortized through the maturity date of our unsecured revolving credit facility.
(4)The maturity date may be extended by two six-month periods, at the Operating Partnership’s election.
The following table summarizes the balance and terms of our 2024 Term Loan Facility as of September 30, 2024:
2024 Term Loan Facility
September 30, 2024
(in thousands)
Outstanding borrowings$200,000 
Remaining borrowing capacity— 
Total borrowing capacity (1)
$200,000 
Interest rate (2)
6.16 %
Maturity date (3)
October 3, 2025
____________________
(1)We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $130.0 million as of September 30, 2024, under an accordion feature pursuant to the terms of the 2024 Term Loan Facility.
(2)Our 2024 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 0.950% based on our credit rating as of September 30, 2024. Additionally, we incurred debt origination and legal costs in connection with the amendment and restatement of the unsecured revolving credit facility. As of September 30, 2024, $1.6 million of unamortized deferred financing costs, inclusive of unamortized initial issuance costs transferred from the 2022 Term Loan Facility, remained to be amortized through the maturity date of the 2024 Term Loan Facility.
(3)The maturity date may be extended by two 12-month periods, at the Operating Partnership’s election.
The following table summarizes the balance and terms of our 2022 Term Loan Facility as of December 31, 2023:
2022 Term Loan Facility
December 31, 2023
(in thousands)
Outstanding borrowings$520,000 
Remaining borrowing capacity— 
Total borrowing capacity$520,000 
Interest rate (1)
6.41 %
Undrawn facility fee-annual rate (2)
0.200%
Maturity dateOctober 3, 2024
____________________
(1)Our 2022 Term Loan Facility interest rate was calculated using Adjusted SOFR plus a margin of 0.950% based on our credit rating as of December 31, 2023.
(2)Our undrawn facility fee was paid on a quarterly basis and was calculated based on the remaining borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of December 31, 2023, $2.3 million of unamortized deferred financing costs remained to be amortized through the maturity date of our 2022 Term Loan Facility.
Schedule of Debt Maturities
The following table summarizes the stated debt maturities and scheduled amortization payments for all outstanding debt as of September 30, 2024:

Year
(in thousands)
Remaining 2024$405,235 
2025 (1)
606,246 
2026401,317 
2027249,125 
2028400,000 
2029475,000 
Thereafter2,500,000 
Total aggregate principal value5,036,923 
Less: unamortized net discounts and deferred financing costs (2)
(35,767)
Total debt, net$5,001,156 
________________________ 
(1)Includes the $200.0 million outstanding as of September 30, 2024 on the 2024 Term Loan Facility, for which the Company has two 12-month extension options.
(2)Includes $27.0 million of unamortized deferred financing costs for the unsecured term loan facility, unsecured senior notes, and secured debt and $8.8 million of unamortized discounts for the unsecured senior notes. Excludes unamortized deferred financing costs on the unsecured revolving credit facility, which are included in prepaid expenses and other assets, net on our consolidated balance sheets.
Schedule of Capitalized Interest and Loan Fees
The following table sets forth gross interest expense, including debt discount and deferred financing cost amortization, net of capitalized interest, for the three and nine months ended September 30, 2024 and 2023. The interest expense capitalized was recorded as a cost of development and redevelopment and increased the carrying value of undeveloped land and construction in progress.
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
(in thousands)
Gross interest expense$57,235 $49,893 $173,191 $139,148 
Capitalized interest and deferred financing costs (20,827)(20,056)(61,149)(57,257)
Interest expense$36,408 $29,837 $112,042 $81,891