This type of agreement is illegal in Utah and many other states. A quick summary of the changes to the Utah Association of Realtors new forms that they have implemented to comply with the NAR settlement that's happening.The following documents contain model language and samples that can be used to implement the different aspects of the MLS Listing Content module. I. The Listing Contract. A. A listing is a bilateral agreement between the listing broker (the agent) and the seller (the principal). Agent under the laws in the State. Upon signing of this Listing Agreement, the Seller agrees to personally complete and sign'a Seller's Property. Condition Disclosure form. Listing agreements serve as a hiring contract with the agent for the sale of a property, and are only valid for a set amount of time. As a general rule, you should not start working with a seller without first having them sign this document.