An international sale agreement establishes the terms for a transaction between a seller and buyer located in different countries. 20. Purchase and Sale.A commercial real estate purchase agreement is a legal contract between the buyer and seller of a commercial property. Seller agrees to sell to Buyer and Buyer agrees to purchase from Seller the following described real estate in. Anyone seeking advice or assistance to fill out such forms should contact a legal clinic or lawyer. Need a real estate contract to sell your property? Use and customize a FREE real estate purchase agreement in minutes. Many REALTORS® contact the National Association looking for real estate forms. How do I write a Sales Agreement? Specify your location.