An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal. Create yours now with our free form.Enter the date and property information clearly. This file contains detailed instructions for completing the NWMLS Form No. 21, a Residential Real Estate Purchase and Sale Agreement. ("Broker") beginning (date). Step 2: Purchase Price. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. Form TOPA in a counter offer if not part of Buyer's offer. REMOVAL OF CONTINGENCIES WITH OFFER: Buyer removes the contingencies specified in the attached Contingency. Step 2: Purchase Price.