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Secured and Unsecured Debt of the Operating Partnership (Tables) - Kilroy Realty L.P. [Member]
 12 Months Ended
Dec. 31, 2020
Debt Instrument [Line Items]  
Unsecured revolving credit facility
The following table summarizes the balance and terms of our unsecured revolving credit facility as of December 31, 2020 and 2019:
December 31, 2020December 31, 2019
(in thousands)
Outstanding borrowings$— $245,000 
Remaining borrowing capacity750,000 505,000 
Total borrowing capacity (1)
$750,000 $750,000 
Interest rate (2)
1.14 %2.76 %
Facility fee-annual rate (3)
0.200%
Maturity dateJuly 2022
____________________
(1)We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $600.0 million under an accordion feature under the terms of the unsecured revolving credit facility and unsecured term loan facility.
(2)Our unsecured revolving credit facility interest rate was calculated based on the contractual rate of LIBOR plus 1.000% as of December 31, 2020 and 2019.
(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 December 31, 2020 and 2019, $2.1 million and $3.4 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. The following table summarizes the balance and terms of our unsecured term loan facility as of December 31, 2019, which is included in unsecured debt, net on our consolidated balance sheets:
December 31, 2019
Outstanding borrowings$150,000 
Remaining borrowing capacity— 
Total borrowing capacity (1)
$150,000 
Interest rate (2)
2.85 %
Undrawn facility fee-annual rate0.200%
Maturity dateJuly 2022
____________________
(1)As of December 31, 2019, $0.7 million of unamortized deferred financing costs remained to be amortized through the maturity date of our unsecured term loan facility.
(2)Our unsecured term loan facility interest rate was calculated based on the contractual rate of LIBOR plus 1.100% as of December 31, 2019.
Schedule of debt maturities
The following table summarizes the stated debt maturities and scheduled amortization payments as of December 31, 2020:

Year(in thousands)
2021$5,342 
20225,554 
2023305,775 
2024431,006 
2025406,246 
Thereafter2,800,442 
Total aggregate principal value (1)
$3,954,365 
________________________ 
(1)     Includes gross principal balance of outstanding debt before the effect of the following at December 31, 2020: $22.4 million of unamortized deferred financing costs for the unsecured senior notes and secured debt and $8.3 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/premium and deferred financing cost amortization, net of capitalized interest, for the years ended December 31, 2020, 2019 and 2018. The interest expense capitalized was recorded as a cost of development and increased the carrying value of undeveloped land and construction in progress.

Year Ended December 31,
202020192018
(in thousands)
Gross interest expense$150,325 $129,778 $117,789 
Capitalized interest and deferred financing costs(79,553)(81,241)(68,068)
Interest expense$70,772 $48,537 $49,721 
Secured debt [Member]  
Debt Instrument [Line Items]  
Debt balance and significant terms
The following table sets forth the composition of our secured debt as of December 31, 2020 and 2019:

Annual Stated Interest Rate (1)
GAAP
Effective Rate (1)(2)
Maturity DateDecember 31,
Type of Debt20202019
(in thousands)
Mortgage note payable3.57%3.57%December 2026$166,776 $170,000 
Mortgage note payable (3)
4.48%4.48%July 202787,589 89,502 
Total secured debt$254,365 $259,502 
Unamortized Deferred Financing Costs(783)(909)
Total secured debt, net$253,582 $258,593 
____________________
(1)All interest rates presented are fixed-rate interest rates.
(2)Represents the effective interest rate including the amortization of initial issuance discounts/premiums excluding the amortization of deferred financing costs.
(3)The secured debt and the related properties that secure this debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.
Unsecured senior notes [Member]  
Debt Instrument [Line Items]  
Debt balance and significant terms The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership and outstanding, including the issuances noted above, and including unamortized discounts of $8.3 million and $6.5 million and unamortized deferred financing costs of $21.6 million and $18.7 million as of December 31, 2020 and 2019, respectively:
Net Carrying Amount
as of December 31,
Issuance dateMaturity dateStated
coupon rate
Effective interest rate (1)
20202019
(in thousands)
2.500% Unsecured Senior Notes (2)
August 2020November 20322.500%2.560%$425,000 $— 
Unamortized discount and deferred financing costs(6,332)— 
Net carrying amount$418,668 $— 
4.270% Unsecured Senior Notes (3)
April 2020January 20314.270%4.270%$350,000 $— 
Unamortized discount and deferred financing costs(1,825)— 
Net carrying amount$348,175 $— 
3.050% Unsecured Senior Notes (4)
September 2019February 20303.050%3.064%$500,000 $500,000 
Unamortized discount and deferred financing costs(5,399)(5,998)
Net carrying amount$494,601 $494,002 
4.750% Unsecured Senior Notes (5)
November 2018December 20284.750%4.800%$400,000 $400,000 
Unamortized discount and deferred financing costs(3,952)(4,446)
Net carrying amount$396,048 $395,554 
4.350% Unsecured Senior Notes (6)
October 2018October 20264.350%4.350%$200,000 $200,000 
Unamortized discount and deferred financing costs(1,012)(1,186)
Net carrying amount$198,988 $198,814 
4.300% Unsecured Senior Notes (6)
July 2018July 20264.300%4.300%$50,000 $50,000 
Unamortized discount and deferred financing costs(246)(290)
Net carrying amount$49,754 $49,710 
3.450% Unsecured Senior Notes (7)
December 2017December 20243.450%3.470%$425,000 $425,000 
Unamortized discount and deferred financing costs(2,321)(2,907)
Net carrying amount$422,679 $422,093 
3.450% Unsecured Senior Notes (8)
February 2017February 20293.450%3.450%$75,000 $75,000 
Unamortized discount and deferred financing costs(347)(390)
Net carrying amount$74,653 $74,610 
3.350% Unsecured Senior Notes (8)
February 2017February 20273.350%3.350%$175,000 $175,000 
Unamortized discount and deferred financing costs(709)(825)
Net carrying amount$174,291 $174,175 
4.375% Unsecured Senior Notes (9)
September 2015October 20254.375%4.444%$400,000 $400,000 
Unamortized discount and deferred financing costs(2,631)(3,185)
Net carrying amount$397,369 $396,815 
4.250% Unsecured Senior Notes (10)
July 2014August 20294.250%4.350%$400,000 $400,000 
Unamortized discount and deferred financing costs(4,567)(5,100)
Net carrying amount$395,433 $394,900 
3.800% Unsecured Senior Notes (11)
January 2013January 20233.800%3.800%$300,000 $300,000 
Unamortized discount and deferred financing costs(560)(834)
Net carrying amount$299,440 $299,166 
Total Unsecured Senior Notes, Net$3,670,099 $2,899,839 
____________________
(1)Represents the effective interest rate including the amortization of initial issuance discounts, excluding the amortization of deferred financing costs.
(2)Interest on these notes is payable semi-annually in arrears on May 15 and November 15 of each year.
(3)Interest on these notes is payable semi-annually in arrears on April 18 and October 18 of each year.
(4)Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year.
(5)Interest on these notes is payable semi-annually in arrears on June 15th and December 15th of each year.
(6)Interest on these notes is payable semi-annually in arrears on April 18th and October 18th of each year.
(7)Interest on these notes is payable semi-annually in arrears on June 15th and December 15th of each year.
(8)Interest on these notes is payable semi-annually in arrears on February 17th and August 17th of each year.
(9)Interest on these notes is payable semi-annually in arrears on April 1st and October 1st of each year.
(10)Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year.
(11)Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year.