A listing agreement is a contract between homeowners and brokers that legally establishes how a realtor will find a property buyer on the seller's behalf. Want to file online?Use our Online Property Listing System to file your current year listing form. For example, the Listing Agreement authorizes a seller's broker to attempt to sign up unrepresented buyers who attend open houses or other property showings. Fill out form RE10 or RE11 with Broker. Mail or Fax to DBPR. 2. A real estate listing agreement also known as a seller's agent agreement is a contract between a property owner and a real estate broker. Buyer's Agency Agreement A contract formed between a broker and a potential buyer. The listing contract gives the broker the authority to act on behalf of the seller as an agent in the sale of real property included in the agreement.