Our leased assets include offices and studios, transmitter locations, antenna sites, tower and tower sites, and land. Our lease portfolio has terms remaining from less than to up to twenty years. Many of these leases contain options under which we can extend the term from five to twenty years. Renewal options are excluded from our calculation of lease liabilities unless we are reasonably assured to exercise the renewal option. Our lease agreements do not contain residual value guarantees or material restrictive covenants. We lease certain properties from our principal stockholders or from trusts and partnerships created for the benefit of the principal stockholders and their families. These leases are designated as Related Party leases in the details provided.

Operating leases are reflected on our balance sheet within operating lease ROU assets and the related current and operating lease liabilities. ROU assets represent the right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make lease payments arising from lease agreement. Operating lease ROU assets and liabilities are recognized at the commencement date, or the date on which the lessor makes the underlying asset available for use, based upon the present value of the lease payments over the respective lease term. Lease expense is recognized on a straight-line basis over the lease term, subject to any changes in the lease or expectation regarding the lease terms. Variable lease costs, such as common area maintenance, property taxes and insurance, are expensed as incurred.

Future minimum lease payments under leases that had initial or remaining lease terms in excess of one year as of March 31, 2021, are as follows: