The residential purchase agreement can be used to negotiate compensation from the seller to the buyer's broker. Below, we've outlined the steps and forms required for how to sell a car in the state of California so you can sell your car quickly for the most cash.A vehicle sales agreement is a lawful arrangement summarizing the terms and conditions of a vehicle sale between a customer and a seller. ("Broker") beginning (date). CAR offers a wide range of forms that cover various aspects of real estate transactions, leases, disclosures, and agreements. When buying a vehicle or equipment for your business, use this Vehicle and Equipment Purchase Agreement to protect yourself from unwarranted liabilities.