PAR's Buyer Agency Contract includes all of the legallyrequired language and allows for a buyer's broker fee to be structured in several ways. View the forms library.Your offer must be presented in the form of an Agreement of Sale. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction. A For Sale By Owner contract Pennsylvania must include: 1. The Purchase Price, 2. As a seller, you also are required under Pennsylvania law to fill out a Seller's Property Disclosure Statement. Who Draws up Contract in For Sale By Owner? A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction. It details what is needed to sell and buy a property in the entire state of Pennsylvania.