Call (215) 545-4830 - Danziger Shapiro, P.C. is dedicated to serving our clients with a range of legal services including Business and Corporate cases. 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.View the forms library. The purpose of a buysell agreement is to protect your interests and your business against the unpredictability of life. You can submit a request for an agreement online through the Philadelphia Tax Center. Here's how: Log into your Philadelphia Tax Center profile. This guide will break down what a good agreement of sale should contain. It should be useful for anyone buying or selling real estate. Legal advise and agreements for purchasing a business or selling a business. Get our free, updated 2022 checklist for business buyers.