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. The Standard Agreement for the Sale of Real Estate should be used in transactions to outline the terms of the agreement between the buyer and seller.Get a comprehensive understanding of Pennsylvania real estate purchase and sale agreements with our indepth overview and free template. 1. Enter buyer and seller details. This is going to be how to fill out the agreement of sale for pennsylvania. A Pennsylvania purchase agreement creates a secured contract for a residential property transaction. Looking for a Pennsylvania real estate purchase agreement template? Download this free version today.