THIS PURCHASE AND SALE AGREEMENT, (the "Agreement") is made and entered into this _____ day of. EXHIBITS. Exhibit "A".Description of Land. Y. Seller's Attorney Approval. Sales contracts are legally binding written agreements that govern a transaction between a buyer and a seller. Getting ready to write an offer for a house? In this video, I show you how to fill out the As-Is contract to purchase a home. Prior to completing purchase orders with the Contractor. A Sale and Purchase agreement has to be in writing. The buyer should note the timing to apply for approvals set forth in the contract.