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Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty L.P. [Member]
 9 Months Ended
Sep. 30, 2021
Debt Instrument [Line Items]  
Unsecured revolving credit facility
The following table summarizes the balance and terms of our unsecured revolving credit facility as of September 30, 2021 and December 31, 2020:
September 30, 2021December 31, 2020
(in thousands)
Outstanding borrowings$— $— 
Remaining borrowing capacity
1,100,000 750,000 
Total borrowing capacity (1)
$1,100,000 $750,000 
Interest rate (2)
0.98 %1.14 %
Facility fee-annual rate (3)
0.200%
Maturity dateJuly 2025July 2022
________________________
(1)We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $500.0 million and $600.0 million as of September 30, 2021 and December 31, 2020, respectively, under an accordion feature under the terms of the unsecured revolving credit facility.
(2)Our unsecured revolving credit facility interest rate was calculated based on the contractual rate of LIBOR plus 0.900% and LIBOR plus 1.000% as of September 30, 2021 and December 31, 2020, respectively.
(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. As of September 30, 2021 and December 31, 2020, $7.8 million and $2.1 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 respective maturity dates presented of our unsecured revolving credit facility.
Schedule of debt maturities
The following table summarizes the stated debt maturities and scheduled amortization payments as of September 30, 2021:
Year
(in thousands)
Remaining 2021$1,356 
20225,554 
2023 (1)
305,775 
2024431,006 
2025406,246 
2026401,316 
Thereafter2,399,125 
Total aggregate principal value (1)(2)
$3,950,378 
________________________ 
(1)Excludes the $450.0 million of 12-year, 2.65% green unsecured senior notes issued in October 2021 and the early redemption of the $300.0 million of 3.80% unsecured senior notes in October 2021. Refer to Note 17 “Subsequent Events” for additional information.
(2)Includes gross principal balance of outstanding debt before the effect of the following at September 30, 2021: $20.0 million of unamortized deferred financing costs for the unsecured senior notes and secured debt and $7.5 million of unamortized discounts for the unsecured senior notes.
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, 2021 and 2020. The interest expense capitalized was recorded as a cost of development and increased the carrying value of undeveloped land and construction in progress.
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(in thousands)
Gross interest expense$39,552 $38,807 $118,257 $111,069 
Capitalized interest and deferred financing costs (23,447)(19,339)(58,428)(61,273)
Interest expense$16,105 $19,468 $59,829 $49,796