("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.Combined Contract Schedules for Construction and Professional Services Contracts. To use the latest web form version please click on this link. No assurance can be given that our applications for these listings will be approved or that a trading market will develop. Can a realtor sign a sales contract without a complete listing agreement?