OFFER: A. THIS IS AN OFFER FROM. ("Buyer"). The Vacant Land Purchase Agreement (VLPA) is the contract form to use when selling vacant land in California.A California land contract records the terms of the sale of an undeveloped or vacant property. A California land purchase agreement is a contract that is used for an exchange of real estate between a seller and a buyer. Gather essential details: Collect information about the property, buyer, seller, price, and terms.