NOTE 13  COMMITMENTS AND CONTINGENCIES Lease Commitments As of December 31, 2017 , the Company is a tenant under various operating leases with third parties related to certain of its delivery hubs, vending machines and offices. The initial terms expire at various dates between 2018 and 2032 , and many of the leases include renewal options ranging from three to twenty years. Rent is recognized on a straight-line basis over the lease term and includes scheduled rent increases as well as amortization of tenant improvement allowances. Rent expense for these operating leases was approximately $4.2 million , $0.9 million and $0.3 million for years ended December 31, 2017 , 2016 and 2015 , respectively. In September 2016, the Company entered into a lease with a third party for the second floor of its corporate headquarters in Tempe, Arizona. The lease has an initial term of 83 months and has three five -year extension options. At the request of the landlord, DriveTime agreed to partially guarantee the lease payments until September 2019 . The Company started incurring rent expense for this lease in April 2017, and it is included within the third party rent expense discussed above. The Company also has lease agreements with DriveTime that provide the Company access to and utilization of space at various DriveTime inspection and reconditioning centers, temporary storage locations and retail facilities. Additionally, the Company entered into a sublease with DriveTime for the use of the first floor of its corporate headquarters in Tempe, Arizona. See Note 5  Related Party Transactions for further related party lease information. Beginning in December 2017, the Company has operating leases with third parties for certain of its transportation fleet. The initial lease terms are for two years from the delivery date of each individual vehicle to the Company, at which time each lease will extend on a month-to-month basis for a potential total lease term of six years unless both parties agree to earlier termination or replacemen