"I tell my agents two things when filling out the listing agreement," says Watrous. 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.The SCA was designed to be an addendum available for use with multiple Arizona REALTORS® purchase contracts. Beginning in midAugust, NAR's proposed settlement agreement requires members to sign written agreements with potential buyers prior to touring a home. Listing and Buyer Employment Agreements. Written in clear and unambiguous language.