Learn about real estate purchase agreements and review tips for agents to protect buyers with well-prepared real estate contracts and negotiations. When it comes to filling out a real estate purchase agreement, several key players are involved: buyers, sellers, real estate agents, and attorneys.The first thing to include in a purchase agreement are the full names of the buyer(s) and seller(s). A purchase agreement is a contract between the buyer and seller of a home. It contains all the rules that apply to the sale. A real estate purchase agreement spells out the terms under which a buyer and seller agree to engage in a real estate transaction. First and foremost, a purchase agreement must outline the property at stake. It should include the exact address of the property and a clear legal description.