Filed with the Securities and Exchange Commission. Sample Mortgage Agreement.The terms in your document will update based on the information you provide. This Agreement is not assignable without the prior written consent of the. The real estate sales transaction begins with the offer. Detailed information about canceling listing agreements and contracts, calculating time periods and other common real estate scenarios. After completing this form, you should sign the form. You should then file this document with the clerk of the circuit court in the county where the petition. A Florida residential purchase agreement outlines the terms of a transaction between the seller of residential property and the buyer.