The Company has operating leases for office space that include fixed base rent payments, as well as variable rent payments to reimburse the landlord for operating expenses and taxes. The Company’s variable lease payments do not depend on a published index or rate, and therefore, are expensed as incurred. The Company includes only fixed payments for lease components in the measurement of the right-of-use asset and lease liability. There are no residual value guarantees.

Operating lease costs and variable lease costs included in general and administrative expenses for the three months ended June 30, 2022 were $0.2 million and less than $0.1 million, respectively ($0.5 million and $0.1 million for the six months ended June 30, 2022). Operating lease costs and variable lease costs included in general and administrative expenses for the three months ended June 30, 2021 were $0.2 million and $0.1 million, respectively ($0.5 million and $0.1 million for the six months ended June 30, 2021).

The annual maturities of lease liabilities as of June 30, 2022 were as follows:

The weighted-average remaining lease term for our operating leases was 3.46 years as of June 30, 2022. The weighted average discount rate of our operating leases was 5.15% as of June 30, 2022. Cash paid for amounts included in the measurement of lease liabilities was $0.5 million and $0.5 million for the six months ended June 30, 2022 and June 30, 2021, respectively.

The Company owns the Real Property that is subject to a long-term triple net lease agreement with an unrelated third-party. The lease provides for future rent escalations and renewal options. The initial lease term ends in May 2034. The lessee bears the cost of maintenance and property taxes. Rental income from operating leases is recognized on a straight-line basis, based on contractual lease terms with fixed and determinable increases over the non-cancellable term of the related lease when collectability is reasonably assured. Rental revenue includes a de minimus amount of amortization of below market lease liabilities for the three and six months ended June 30, 2022 and June 30, 2021. The estimated aggregate future amortization of below market lease liabilities is $0.1 million for 2022, $0.1 million for 2023, $0.1 million for 2024, $0.1 million for 2025 and $0.1 million for 2026. Realization of the residual values of the assets under lease is dependent on the future ability to market the assets under prevailing market conditions. The lease is classified as an operating lease and the underlying leased assets are included in property and equipment in the consolidated balance sheets. R efer to Note 9 , " Property and Equipment ".

The Company acquired the LA Real Property on December 30, 2021. The LA Real Property is subject to a long-term lease agreement with an unrelated third-party. The lease provides for future rent decreases. The initial lease term ends in March 2035. The lessee bears the cost of maintenance and property taxes. Rental income from operating leases is recognized on a straight-line basis, based on contractual lease terms with fixed and determinable increases over the non-cancellable term of the related lease when collectability is reasonably assured. Rental revenue includes a de minimus amount of amortization of above-market lease asset related to the LA Real Property for the three and six months ended June 30, 2022. The estimated aggregate future amortization of above-market lease asset is $0.1 million for 2022, $0.1 million for 2023, $0.1 million for 2024, $0.1 million for 2025 and $0.1 million for 2026. Realization of the residual values of the assets under lease is dependent on the future ability to market the assets under prevailing market conditions. The lease is classified as an operating lease and the underlying leased assets are included in property and equipment in the consolidated balance sheets. Refer to Note 9, "Property and Equipment".

Lease revenue related to operating lease payments was $3.6 million and $3.3 millionfor the three months ended June 30, 2022 and June 30, 2021, respectively ($7.2 million and $6.7 million for the six months ended June 30, 2022 and June 30, 2021, respectively). Lease revenue related to variable lease payments was less than $0.1 million and zero for the three months ended June 30, 2022 and June 30, 2021, respectively ($0.1 million and zero for the six months ended June 30, 2022 and June 30, 2021, respectively).

The following table provides the net book value of operating lease property included in property and equipment in the consolidated balance sheets at June 30, 2022 and December 31, 2021:

As of June 30, 2022, future undiscounted cash flows to be received in each of the next five years and thereafter, on non-cancelable operating leases are as follows: