Commitments and Contingencies General As of December 31,2016 , we had commitments of approximately $538.6million , excluding our ground lease commitments, for contracts and executed leases directly related to our operating and development properties. Ground Leases The following table summarizes our properties that are held subject to long-term noncancellable ground lease obligations and the respective contractual expiration dates: Property Contractual Expiration Date (1) 601 108th Ave NE, Bellevue, WA November 2093 701, 801 and 837 N. 34th Street, Seattle, WA (2) December 2041 1701 Page Mill Road and 3150 Porter Drive, Palo Alto, CA December 2067 Kilroy Airport Center Phases I, II, and III, Long Beach, CA July 2084 ____________________ (1) Reflects the contractual expiration date prior to the impact of any extension or purchase options held by the Company. (2) The Company has three 10 year and one 45 year extension options for this ground lease, which if exercised would extend the expiration date to December2116. The minimum commitment under our ground leases as of December 31,2016 for five years and thereafter is as follows: Year Ending (inthousands) 2017 $ 4,934 2018 4,934 2019 4,934 2020 4,934 2021 4,934 Thereafter 231,402 Total (1)(2)(3)(4)(5) $ 256,072 ________________________ (1) Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum ground lease obligations before the impact of ground lease extension options. (2) One of our ground lease obligations is subject to a fair market value adjustment every five years ; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0million . The contractual obligations for that ground lease included above assumes the lesser of $1.0million or annual lease rental obligation in effect as of December 31,2016 . (3) One of our ground lease obligations includes a component which is based on the percentage of gross income th