("Broker") beginning (date). 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 process to doing business with San Bernardino County begins with registering with the online procurement system (ePro). It's a listing where the seller is not obligated to pay anybody a commission unless they bring an offer in the seller accepts it. There is nothing worse than getting trapped into a lengthy listing contract with the wrong agent.