View the forms library. Utilize a Letter of Intent (LOI) to initiate negotiations for a sale, summarizing the terms of a forthcoming contract agreement.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. This is going to be how to fill out the agreement of sale for pennsylvania. Your offer must be in writing. This is done through a Residential Purchase Agreement, which must conform to varying state and local laws. 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. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer.