The official website of Allegheny County, PA, which provides information on services, licenses, records and permits for our citizens and businesses. A contract of sale is a written agreement to transfer ownership of property.The contract does not cause the legal ownership of the property to change. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction. The Seller agrees to sell, and the Institution agrees to buy, the Collection for a total purchase price of ______ ("Purchase Price"). The Institution shall. This document provides information on how to write a vehicle sale agreement in India.