Sellers guardian a licensed real estate agent in the state of Washington. Seller authorizes Firm to appoint.As Seller's Listing Broker. (1) "Agency relationship" means the agency relationship created under this chapter between a real estate firm and a principal. This is a legally binding contract, if not fully understood seek competent legal advice before signing. An exclusive right to sell listing agreement is a contract with a real estate agent or broker that gives them exclusive rights to sell and market your home. This pamphlet provides general information about real estate brokerage and summarizes the laws related to real estate brokerage relationships. Contrast an Exclusive Right to Sell and Exclusive Agency Listing Agreements. • Know the 5 factors that determine a valid contract. Exclusive agency listing agreements are most often used with flatfee listing brokers who provide limited service to their clients.