This is going to be how to fill out the agreement of sale for pennsylvania. 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).The expertise of Elfant Wissahickon REALTORS will help you understand the various terms, contingencies and responsibilities outlined in the Agreement of Sale. The agreement of sale is strictly who's on first what's on second who are the players and that's what we're going to identify here. If you are planning to make an offer in Philadelphia, we've compiled a stepbystep guide so you know what to expect. View the forms library. Everything you need to know to represent your seller! Since verbal offers aren't legal in a real estate sale, your offer must be in writing. Both parties will sign the offer form to show that they agree to the terms and conditions within. Option contracts offer buyers a chance to put a property "on hold" until they're ready to complete the purchase.