The Standard Agreement for the Sale of Vacant Land (Form ASVL) is the contract for the sale of unimproved real estate containing commonly used clauses. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction.The Consumer Guide is designed to help consumers better understand the major terms of the Standard Agreement for the Sale of Real Estate (Form ASR). Get a comprehensive understanding of Pennsylvania real estate purchase and sale agreements with our indepth overview and free template. It includes the agreed-upon price, the legal description of the land or lot, and any additional financial contingencies the parties wish to include. The real estate purchase agreement is a contract between the buyer and seller of the real estate. This is going to be how to fill out the agreement of sale for pennsylvania. A For Sale By Owner contract Pennsylvania must include: 1. The Purchase Price, 2.