The Original Agreement is on file at the Carrier's General Office. A car lease agreement is a legal contract laying out the terms of paying for and using a car over a set period of time.An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. Lease-End Buyout Guide: Evaluating How and When You Should Purchase Your Leased Car. Below is a list of forms and information that may be required to complete a Request for Proposal Response. When you file Form RUT-25-LSE, attach a copy of the lease contract as proof of the selling price and of any tax previously paid. Tenant responsibilities: Example paying rent on time. Real estate agents role (if applicable). III. For properties in the city of Chicago, view the RLTO disclosures. 1. Concession Granted (conditional) – Any concession for rent must be mentioned in the lease.