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Leases (Notes) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Leases | Refer to the “Lease accounting” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements for information about lease accounting standards that set principles for the recognition, measurement, presentation, and disclosure of leases for both parties to a lease agreement (i.e., lessees and lessors). Leases in which we are the lessor As of December 31, 2023, we had 411 properties aggregating 42.0 million operating RSF locate d in key clusters, including Greater Boston, the San Francisco Bay Area, New York City, San Diego, Seattle, Maryland, and Research Triangle. We focus on developing Class A/A+ properties in AAA innovation cluster locations, which we consider to be highly desirable for tenancy by life science, agtech, and technology entities. Such locations are generally characterized by high barriers to entry for new landlords, high barriers to exit for tenants, and a limited supply of available space. As of December 31, 2023, a ll leases in which we are the lessor were classified as operating leases, with the exception of one direct financing lease. Our leases are described below. Operating leases As of December 31, 2023, our 411 properties were subject to operating lease agreements. Two of these properties, representing two land parcels, are subject to lease agreements that each contain an option for the lessee to purchase the underlying asset from us at fair market value during each of the 30-day periods commencing on the dates that are 15 years, 30 years, and 74.5 years after the rent commencement date of October 1, 2017. The remaining lease term related to each of the two land parcels is 68.9 years. Our leases generally contain options to extend lease terms at prevailing market rates at the time of expiration. Certain operating leases contain early termination options that require advance notification and payment of a penalty, which in most cases is substantial enough to be deemed economically disadvantageous by a tenant to exercise. Future lease payments to be received under the terms of our operating lease agreements, excluding expense reimbursements, in effect as of December 31, 2023 are outlined in the table below (in thousands):
Year |  | Amount
2024 |  | $ | 1,862,795 |
2025 |  | 1,868,217 |
2026 |  | 1,817,938 |
2027 |  | 1,738,305 |
2028 |  | 1,607,062 |
Thereafter |  | 10,201,534 |
Total |  | $ | 19,095,851 |
Refer to Note 3 – “Investments in real estate” to our consolidated financial statements for additional information about our owned real estate assets, which are the underlying assets under our operating leases. Direct financing lease As of December 31, 2023, we had one direct financing lease agreement, with a net investment balance of $40.1 million, for a parking structure with a remaining lease term of 68.9 years. The lessee has an option to purchase the underlying asset at fair market value during each of the 30-day periods commencing on the dates that are 15 years, 30 years, and 74.5 years after the rent commencement date of October 1, 2017. The components of our aggregate net investment in our direct financing lease as of December 31, 2023 and 2022 are summarized in the table below (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Gross investment in direct financing lease |  | $ | 253,324 |  |  | $ | 255,186 |
Less: unearned income on direct financing lease |  | (210,388) |  |  | (212,995) |
Less: allowance for credit losses |  | (2,839) |  |  | (2,839) |
Net investment in direct financing lease |  | $ | 40,097 |  |  | $ | 39,352 |
As of December 31, 2023, our estimated credit loss related to our direct financing lease was $2.8 million. No adjustment to the estimated credit loss balance was required during the year ended December 31, 2023. For further details, refer to the “Allowance for credit losses” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements. Future lease payments to be received under the terms of our direct financing lease as of December 31, 2023 are outlined in the table below (in thousands):
Year |  | Total
2024 |  | $ | 1,919 |
2025 |  | 1,976 |
2026 |  | 2,036 |
2027 |  | 2,097 |
2028 |  | 2,160 |
Thereafter |  | 243,136 |
Total |  | $ | 253,324 |
Income from rentals Our income from rentals includes revenue related to agreements for the rental of our real estate, which primarily includes revenues subject to the lease accounting standard and the revenue recognition accounting standard as shown below (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Income from rentals: |  |  |  |  |  |
Revenues subject to the lease accounting standard: |  |  |  |  |  |
Operating leases |  | $ | 2,802,567 |  |  | $ | 2,534,862 |  |  | $ | 2,081,362 |
Direct financing and sales-type leases(1) |  | 2,608 |  |  | 3,094 |  |  | 3,489 |
Revenues subject to the lease accounting standard |  | 2,805,175 |  |  | 2,537,956 |  |  | 2,084,851 |
Revenues subject to the revenue recognition accounting standard |  | 37,281 |  |  | 38,084 |  |  | 23,398 |
Income from rentals |  | $ | 2,842,456 |  |  | $ | 2,576,040 |  |  | $ | 2,108,249 |
(1)We completed the sale of our real estate assets subject to sales-type leases in May 2022 and have had no sales-type leases since then. Our revenues that are subject to the revenue recognition accounting standard and are classified in income from rentals consist primarily of short-term parking revenues that are not considered lease revenues under the lease accounting standard. Refer to the “Revenues” and “Recognition of revenue arising from contracts with customers” sections in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements for additional information. Deferred leasing costs The following table summarizes our deferred leasing costs as of December 31, 2023 and 2022 (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Deferred leasing costs |  | $ | 1,035,339 |  |  | $ | 996,116 |
Accumulated amortization |  | (525,941) |  |  | (479,841) |
Deferred leasing costs, net |  | $ | 509,398 |  |  | $ | 516,275 |
Residual value risk management strategy Our leases do not have guarantees of residual value on the underlying assets. We manage risk associated with the residual value of our leased assets by (i) evaluating each potential acquisition of real estate to determine whether it meets our business objective to invest primarily in high-demand markets with limited supply of available space, (ii) directly managing our leased properties, conducting frequent property inspections, proactively addressing potential maintenance issues before they arise, and timely resolving any occurring issues, and (iii) carefully selecting our tenants and monitoring their credit quality throughout their respective lease terms. Leases in which we are the lessee Operating lease agreements We have operating lease agreements in which we are the lessee consisting of ground and office leases. Certain of these leases have options to extend or terminate the contract terms upon meeting certain criteria. There are no notable restrictions or covenants imposed by the leases, nor guarantees of residual value. We recognize a right-of-use asset, which is classified within other assets in our consolidated balance sheets, and a related liability, which is classified within accounts payable, accrued expenses, and other liabilities in our consolidated balance sheets, to account for our future obligations under ground and office lease arrangements in which we are the lessee. Refer to the “Lessee accounting” subsection of the “Lease accounting” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements. As of December 31, 2023, the present value of the remaining contractual payments aggregating $848.9 million under our operating lease agreements, including our extension options that we are reasonably certain to exercise, was $382.9 million. Our corresponding operating lease right-of-use assets, adjusted for initial direct leasing costs and other consideration exchanged with the landlord prior to the commencement of the lease, aggregated $516.5 million. As of December 31, 2023, the weighted-average remaining lease term of operating leases in which we are the lessee was approximately 41 years, and the weighted-average discount rate was 4.6%. The weighted-average discount rate is based on the incremental borrowing rate estimated for each lease, which is the interest rate that we estimate we would have to pay to borrow on a collateralized basis over a similar term for an amount equal to the lease payments. Ground lease obligations as of December 31, 2023, included leases for 36 of our properties, which accounted for approximately 9% of our total number of properties. Excluding one ground lease that expires in 2036 related to one operating property with a net book value of $5.7 million as of December 31, 2023, our ground lease obligations have remaining lease terms ranging from approximately 31 to 98 years, including extension options that we are reasonably certain to exercise. The reconciliation of future lease payments under noncancelable operating leases in which we are the lessee, to the operating lease liability reflected in our consolidated balance sheet as of December 31, 2023 is presented in the table below (in thousands):
Year |  | Total
2024 |  | $ | 22,611 |
2025 |  | 22,671 |
2026 |  | 22,865 |
2027 |  | 21,944 |
2028 |  | 21,614 |
Thereafter |  | 737,194 |
Total future payments under our operating leases in which we are the lessee |  | 848,899 |
Effect of discounting |  | (466,016) |
Operating lease liability |  | $ | 382,883 |
Lessee operating costs Operating lease costs relate to our ground and office leases in which we are the lessee. Ground leases generally require fixed annual rent payments and may also include escalation clauses and renewal options. Our operating lease obligations related to our office leases have remaining terms of up to 13 years, exclusive of extension options. For the years ended December 31, 2023, 2022, and 2021, our costs for operating leases in which we are the lessee were as follows (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Gross operating lease costs |  | $ | 39,879 |  |  | $ | 36,527 |  |  | $ | 28,598 |
Capitalized lease costs |  | (5,544) |  |  | (3,661) |  |  | (3,167) |
Expenses for operating leases in which we are the lessee |  | $ | 34,335 |  |  | $ | 32,866 |  |  | $ | 25,431 |
For the years ended December 31, 2023, 2022, and 2021, amounts paid and classified as operating activities in our consolidated statements of cash flows for leases in which we are the lessee were $32.2 million, $55.2 million, and $24.7 million, respectively. The decrease in 2023 from 2022 primarily relates to a $26.3 million payment made during the three months ended March 31, 2022 in connection with the execution of ground lease extensions at two properties in our Greater Stanford submarket.
Leases | Refer to the “Lease accounting” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements for information about lease accounting standards that set principles for the recognition, measurement, presentation, and disclosure of leases for both parties to a lease agreement (i.e., lessees and lessors). Leases in which we are the lessor As of December 31, 2023, we had 411 properties aggregating 42.0 million operating RSF locate d in key clusters, including Greater Boston, the San Francisco Bay Area, New York City, San Diego, Seattle, Maryland, and Research Triangle. We focus on developing Class A/A+ properties in AAA innovation cluster locations, which we consider to be highly desirable for tenancy by life science, agtech, and technology entities. Such locations are generally characterized by high barriers to entry for new landlords, high barriers to exit for tenants, and a limited supply of available space. As of December 31, 2023, a ll leases in which we are the lessor were classified as operating leases, with the exception of one direct financing lease. Our leases are described below. Operating leases As of December 31, 2023, our 411 properties were subject to operating lease agreements. Two of these properties, representing two land parcels, are subject to lease agreements that each contain an option for the lessee to purchase the underlying asset from us at fair market value during each of the 30-day periods commencing on the dates that are 15 years, 30 years, and 74.5 years after the rent commencement date of October 1, 2017. The remaining lease term related to each of the two land parcels is 68.9 years. Our leases generally contain options to extend lease terms at prevailing market rates at the time of expiration. Certain operating leases contain early termination options that require advance notification and payment of a penalty, which in most cases is substantial enough to be deemed economically disadvantageous by a tenant to exercise. Future lease payments to be received under the terms of our operating lease agreements, excluding expense reimbursements, in effect as of December 31, 2023 are outlined in the table below (in thousands):
Year |  | Amount
2024 |  | $ | 1,862,795 |
2025 |  | 1,868,217 |
2026 |  | 1,817,938 |
2027 |  | 1,738,305 |
2028 |  | 1,607,062 |
Thereafter |  | 10,201,534 |
Total |  | $ | 19,095,851 |
Refer to Note 3 – “Investments in real estate” to our consolidated financial statements for additional information about our owned real estate assets, which are the underlying assets under our operating leases. Direct financing lease As of December 31, 2023, we had one direct financing lease agreement, with a net investment balance of $40.1 million, for a parking structure with a remaining lease term of 68.9 years. The lessee has an option to purchase the underlying asset at fair market value during each of the 30-day periods commencing on the dates that are 15 years, 30 years, and 74.5 years after the rent commencement date of October 1, 2017. The components of our aggregate net investment in our direct financing lease as of December 31, 2023 and 2022 are summarized in the table below (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Gross investment in direct financing lease |  | $ | 253,324 |  |  | $ | 255,186 |
Less: unearned income on direct financing lease |  | (210,388) |  |  | (212,995) |
Less: allowance for credit losses |  | (2,839) |  |  | (2,839) |
Net investment in direct financing lease |  | $ | 40,097 |  |  | $ | 39,352 |
As of December 31, 2023, our estimated credit loss related to our direct financing lease was $2.8 million. No adjustment to the estimated credit loss balance was required during the year ended December 31, 2023. For further details, refer to the “Allowance for credit losses” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements. Future lease payments to be received under the terms of our direct financing lease as of December 31, 2023 are outlined in the table below (in thousands):
Year |  | Total
2024 |  | $ | 1,919 |
2025 |  | 1,976 |
2026 |  | 2,036 |
2027 |  | 2,097 |
2028 |  | 2,160 |
Thereafter |  | 243,136 |
Total |  | $ | 253,324 |
Income from rentals Our income from rentals includes revenue related to agreements for the rental of our real estate, which primarily includes revenues subject to the lease accounting standard and the revenue recognition accounting standard as shown below (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Income from rentals: |  |  |  |  |  |
Revenues subject to the lease accounting standard: |  |  |  |  |  |
Operating leases |  | $ | 2,802,567 |  |  | $ | 2,534,862 |  |  | $ | 2,081,362 |
Direct financing and sales-type leases(1) |  | 2,608 |  |  | 3,094 |  |  | 3,489 |
Revenues subject to the lease accounting standard |  | 2,805,175 |  |  | 2,537,956 |  |  | 2,084,851 |
Revenues subject to the revenue recognition accounting standard |  | 37,281 |  |  | 38,084 |  |  | 23,398 |
Income from rentals |  | $ | 2,842,456 |  |  | $ | 2,576,040 |  |  | $ | 2,108,249 |
(1)We completed the sale of our real estate assets subject to sales-type leases in May 2022 and have had no sales-type leases since then. Our revenues that are subject to the revenue recognition accounting standard and are classified in income from rentals consist primarily of short-term parking revenues that are not considered lease revenues under the lease accounting standard. Refer to the “Revenues” and “Recognition of revenue arising from contracts with customers” sections in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements for additional information. Deferred leasing costs The following table summarizes our deferred leasing costs as of December 31, 2023 and 2022 (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Deferred leasing costs |  | $ | 1,035,339 |  |  | $ | 996,116 |
Accumulated amortization |  | (525,941) |  |  | (479,841) |
Deferred leasing costs, net |  | $ | 509,398 |  |  | $ | 516,275 |
Residual value risk management strategy Our leases do not have guarantees of residual value on the underlying assets. We manage risk associated with the residual value of our leased assets by (i) evaluating each potential acquisition of real estate to determine whether it meets our business objective to invest primarily in high-demand markets with limited supply of available space, (ii) directly managing our leased properties, conducting frequent property inspections, proactively addressing potential maintenance issues before they arise, and timely resolving any occurring issues, and (iii) carefully selecting our tenants and monitoring their credit quality throughout their respective lease terms. Leases in which we are the lessee Operating lease agreements We have operating lease agreements in which we are the lessee consisting of ground and office leases. Certain of these leases have options to extend or terminate the contract terms upon meeting certain criteria. There are no notable restrictions or covenants imposed by the leases, nor guarantees of residual value. We recognize a right-of-use asset, which is classified within other assets in our consolidated balance sheets, and a related liability, which is classified within accounts payable, accrued expenses, and other liabilities in our consolidated balance sheets, to account for our future obligations under ground and office lease arrangements in which we are the lessee. Refer to the “Lessee accounting” subsection of the “Lease accounting” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements. As of December 31, 2023, the present value of the remaining contractual payments aggregating $848.9 million under our operating lease agreements, including our extension options that we are reasonably certain to exercise, was $382.9 million. Our corresponding operating lease right-of-use assets, adjusted for initial direct leasing costs and other consideration exchanged with the landlord prior to the commencement of the lease, aggregated $516.5 million. As of December 31, 2023, the weighted-average remaining lease term of operating leases in which we are the lessee was approximately 41 years, and the weighted-average discount rate was 4.6%. The weighted-average discount rate is based on the incremental borrowing rate estimated for each lease, which is the interest rate that we estimate we would have to pay to borrow on a collateralized basis over a similar term for an amount equal to the lease payments. Ground lease obligations as of December 31, 2023, included leases for 36 of our properties, which accounted for approximately 9% of our total number of properties. Excluding one ground lease that expires in 2036 related to one operating property with a net book value of $5.7 million as of December 31, 2023, our ground lease obligations have remaining lease terms ranging from approximately 31 to 98 years, including extension options that we are reasonably certain to exercise. The reconciliation of future lease payments under noncancelable operating leases in which we are the lessee, to the operating lease liability reflected in our consolidated balance sheet as of December 31, 2023 is presented in the table below (in thousands):
Year |  | Total
2024 |  | $ | 22,611 |
2025 |  | 22,671 |
2026 |  | 22,865 |
2027 |  | 21,944 |
2028 |  | 21,614 |
Thereafter |  | 737,194 |
Total future payments under our operating leases in which we are the lessee |  | 848,899 |
Effect of discounting |  | (466,016) |
Operating lease liability |  | $ | 382,883 |
Lessee operating costs Operating lease costs relate to our ground and office leases in which we are the lessee. Ground leases generally require fixed annual rent payments and may also include escalation clauses and renewal options. Our operating lease obligations related to our office leases have remaining terms of up to 13 years, exclusive of extension options. For the years ended December 31, 2023, 2022, and 2021, our costs for operating leases in which we are the lessee were as follows (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Gross operating lease costs |  | $ | 39,879 |  |  | $ | 36,527 |  |  | $ | 28,598 |
Capitalized lease costs |  | (5,544) |  |  | (3,661) |  |  | (3,167) |
Expenses for operating leases in which we are the lessee |  | $ | 34,335 |  |  | $ | 32,866 |  |  | $ | 25,431 |
For the years ended December 31, 2023, 2022, and 2021, amounts paid and classified as operating activities in our consolidated statements of cash flows for leases in which we are the lessee were $32.2 million, $55.2 million, and $24.7 million, respectively. The decrease in 2023 from 2022 primarily relates to a $26.3 million payment made during the three months ended March 31, 2022 in connection with the execution of ground lease extensions at two properties in our Greater Stanford submarket.
Leases | Refer to the “Lease accounting” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements for information about lease accounting standards that set principles for the recognition, measurement, presentation, and disclosure of leases for both parties to a lease agreement (i.e., lessees and lessors). Leases in which we are the lessor As of December 31, 2023, we had 411 properties aggregating 42.0 million operating RSF locate d in key clusters, including Greater Boston, the San Francisco Bay Area, New York City, San Diego, Seattle, Maryland, and Research Triangle. We focus on developing Class A/A+ properties in AAA innovation cluster locations, which we consider to be highly desirable for tenancy by life science, agtech, and technology entities. Such locations are generally characterized by high barriers to entry for new landlords, high barriers to exit for tenants, and a limited supply of available space. As of December 31, 2023, a ll leases in which we are the lessor were classified as operating leases, with the exception of one direct financing lease. Our leases are described below. Operating leases As of December 31, 2023, our 411 properties were subject to operating lease agreements. Two of these properties, representing two land parcels, are subject to lease agreements that each contain an option for the lessee to purchase the underlying asset from us at fair market value during each of the 30-day periods commencing on the dates that are 15 years, 30 years, and 74.5 years after the rent commencement date of October 1, 2017. The remaining lease term related to each of the two land parcels is 68.9 years. Our leases generally contain options to extend lease terms at prevailing market rates at the time of expiration. Certain operating leases contain early termination options that require advance notification and payment of a penalty, which in most cases is substantial enough to be deemed economically disadvantageous by a tenant to exercise. Future lease payments to be received under the terms of our operating lease agreements, excluding expense reimbursements, in effect as of December 31, 2023 are outlined in the table below (in thousands):
Year |  | Amount
2024 |  | $ | 1,862,795 |
2025 |  | 1,868,217 |
2026 |  | 1,817,938 |
2027 |  | 1,738,305 |
2028 |  | 1,607,062 |
Thereafter |  | 10,201,534 |
Total |  | $ | 19,095,851 |
Refer to Note 3 – “Investments in real estate” to our consolidated financial statements for additional information about our owned real estate assets, which are the underlying assets under our operating leases. Direct financing lease As of December 31, 2023, we had one direct financing lease agreement, with a net investment balance of $40.1 million, for a parking structure with a remaining lease term of 68.9 years. The lessee has an option to purchase the underlying asset at fair market value during each of the 30-day periods commencing on the dates that are 15 years, 30 years, and 74.5 years after the rent commencement date of October 1, 2017. The components of our aggregate net investment in our direct financing lease as of December 31, 2023 and 2022 are summarized in the table below (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Gross investment in direct financing lease |  | $ | 253,324 |  |  | $ | 255,186 |
Less: unearned income on direct financing lease |  | (210,388) |  |  | (212,995) |
Less: allowance for credit losses |  | (2,839) |  |  | (2,839) |
Net investment in direct financing lease |  | $ | 40,097 |  |  | $ | 39,352 |
As of December 31, 2023, our estimated credit loss related to our direct financing lease was $2.8 million. No adjustment to the estimated credit loss balance was required during the year ended December 31, 2023. For further details, refer to the “Allowance for credit losses” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements. Future lease payments to be received under the terms of our direct financing lease as of December 31, 2023 are outlined in the table below (in thousands):
Year |  | Total
2024 |  | $ | 1,919 |
2025 |  | 1,976 |
2026 |  | 2,036 |
2027 |  | 2,097 |
2028 |  | 2,160 |
Thereafter |  | 243,136 |
Total |  | $ | 253,324 |
Income from rentals Our income from rentals includes revenue related to agreements for the rental of our real estate, which primarily includes revenues subject to the lease accounting standard and the revenue recognition accounting standard as shown below (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Income from rentals: |  |  |  |  |  |
Revenues subject to the lease accounting standard: |  |  |  |  |  |
Operating leases |  | $ | 2,802,567 |  |  | $ | 2,534,862 |  |  | $ | 2,081,362 |
Direct financing and sales-type leases(1) |  | 2,608 |  |  | 3,094 |  |  | 3,489 |
Revenues subject to the lease accounting standard |  | 2,805,175 |  |  | 2,537,956 |  |  | 2,084,851 |
Revenues subject to the revenue recognition accounting standard |  | 37,281 |  |  | 38,084 |  |  | 23,398 |
Income from rentals |  | $ | 2,842,456 |  |  | $ | 2,576,040 |  |  | $ | 2,108,249 |
(1)We completed the sale of our real estate assets subject to sales-type leases in May 2022 and have had no sales-type leases since then. Our revenues that are subject to the revenue recognition accounting standard and are classified in income from rentals consist primarily of short-term parking revenues that are not considered lease revenues under the lease accounting standard. Refer to the “Revenues” and “Recognition of revenue arising from contracts with customers” sections in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements for additional information. Deferred leasing costs The following table summarizes our deferred leasing costs as of December 31, 2023 and 2022 (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Deferred leasing costs |  | $ | 1,035,339 |  |  | $ | 996,116 |
Accumulated amortization |  | (525,941) |  |  | (479,841) |
Deferred leasing costs, net |  | $ | 509,398 |  |  | $ | 516,275 |
Residual value risk management strategy Our leases do not have guarantees of residual value on the underlying assets. We manage risk associated with the residual value of our leased assets by (i) evaluating each potential acquisition of real estate to determine whether it meets our business objective to invest primarily in high-demand markets with limited supply of available space, (ii) directly managing our leased properties, conducting frequent property inspections, proactively addressing potential maintenance issues before they arise, and timely resolving any occurring issues, and (iii) carefully selecting our tenants and monitoring their credit quality throughout their respective lease terms. Leases in which we are the lessee Operating lease agreements We have operating lease agreements in which we are the lessee consisting of ground and office leases. Certain of these leases have options to extend or terminate the contract terms upon meeting certain criteria. There are no notable restrictions or covenants imposed by the leases, nor guarantees of residual value. We recognize a right-of-use asset, which is classified within other assets in our consolidated balance sheets, and a related liability, which is classified within accounts payable, accrued expenses, and other liabilities in our consolidated balance sheets, to account for our future obligations under ground and office lease arrangements in which we are the lessee. Refer to the “Lessee accounting” subsection of the “Lease accounting” section in Note 2 – “Summary of significant accounting policies” to our consolidated financial statements. As of December 31, 2023, the present value of the remaining contractual payments aggregating $848.9 million under our operating lease agreements, including our extension options that we are reasonably certain to exercise, was $382.9 million. Our corresponding operating lease right-of-use assets, adjusted for initial direct leasing costs and other consideration exchanged with the landlord prior to the commencement of the lease, aggregated $516.5 million. As of December 31, 2023, the weighted-average remaining lease term of operating leases in which we are the lessee was approximately 41 years, and the weighted-average discount rate was 4.6%. The weighted-average discount rate is based on the incremental borrowing rate estimated for each lease, which is the interest rate that we estimate we would have to pay to borrow on a collateralized basis over a similar term for an amount equal to the lease payments. Ground lease obligations as of December 31, 2023, included leases for 36 of our properties, which accounted for approximately 9% of our total number of properties. Excluding one ground lease that expires in 2036 related to one operating property with a net book value of $5.7 million as of December 31, 2023, our ground lease obligations have remaining lease terms ranging from approximately 31 to 98 years, including extension options that we are reasonably certain to exercise. The reconciliation of future lease payments under noncancelable operating leases in which we are the lessee, to the operating lease liability reflected in our consolidated balance sheet as of December 31, 2023 is presented in the table below (in thousands):
Year |  | Total
2024 |  | $ | 22,611 |
2025 |  | 22,671 |
2026 |  | 22,865 |
2027 |  | 21,944 |
2028 |  | 21,614 |
Thereafter |  | 737,194 |
Total future payments under our operating leases in which we are the lessee |  | 848,899 |
Effect of discounting |  | (466,016) |
Operating lease liability |  | $ | 382,883 |
Lessee operating costs Operating lease costs relate to our ground and office leases in which we are the lessee. Ground leases generally require fixed annual rent payments and may also include escalation clauses and renewal options. Our operating lease obligations related to our office leases have remaining terms of up to 13 years, exclusive of extension options. For the years ended December 31, 2023, 2022, and 2021, our costs for operating leases in which we are the lessee were as follows (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Gross operating lease costs |  | $ | 39,879 |  |  | $ | 36,527 |  |  | $ | 28,598 |
Capitalized lease costs |  | (5,544) |  |  | (3,661) |  |  | (3,167) |
Expenses for operating leases in which we are the lessee |  | $ | 34,335 |  |  | $ | 32,866 |  |  | $ | 25,431 |
For the years ended December 31, 2023, 2022, and 2021, amounts paid and classified as operating activities in our consolidated statements of cash flows for leases in which we are the lessee were $32.2 million, $55.2 million, and $24.7 million, respectively. The decrease in 2023 from 2022 primarily relates to a $26.3 million payment made during the three months ended March 31, 2022 in connection with the execution of ground lease extensions at two properties in our Greater Stanford submarket.

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