Many include a renewal clause, which provides an option to extend the listing period if both parties agree. I am a sales agent and am not sure how to fill out the listing agreement form.Learn what goes into a seller's listing agreement with a real estate agent and what you should know before signing one. Learn how to properly fill out all of the residential listing contract documents and everything associated with it. What do you do when the real estate listing agreement expires? A residential listing agreement is an contract between a property owner and a real estate broker where the broker lists the property for sale.