A California purchase agreement contains all the provisions, disclosures, and general information needed to secure a binding contract. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.How do I fill this out? This document is a Membership Interest Purchase Agreement between a seller and buyer of membership interests in a California limited liability company. Use our template to outline the details such as the purchase price, earnest money deposit, contingencies, and other crucial aspects governing the transaction.