The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. Seller shall sell and convey and Purchaser shall purchase the property, together with all buildings and improvements thereon (collectively the.Agreement to Sell and Purchase. Purchase and Sale of Assets. What's a contract of sale example? Find out how to create a comprehensive contract that safeguards your rights and obligations. A sales and purchase agreement (SPA) is a legal contract that outlines the terms of a transaction and binds an agreement between a buyer and seller. Buyer, whose business address is. A sales agreement is a contract between a buyer and a seller that details the terms of an exchange. It is also known as a sales agreement contract.