The Listing Contract (Seller Agency Contract) – Exclusive Right to Sell Real Estate (Form XLS) gives exclusive right to sell residential real property. 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 Allegheny County Department of. Human Services (DHS), Office of Behavioral Health (OBH) collects this information when contracts are initiated or renewed. The Housing and Food Service (HFS) Contract is a legally-binding contract, obligating the student to on-campus living once it is accepted. This form recommended and approved for, but not restricted to use by, the members of the Pennsylvania Association of Realtors® (PAR). Nestled in the serene Avon Heights community, this delightful 2-bedroom, 1-bath residence offers the perfect blend of comfort and style.