The standard agreement specifies details of the property including purchase price, buyer's responsibilities and much more. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction.Get a comprehensive understanding of Pennsylvania real estate purchase and sale agreements with our indepth overview and free template. A For Sale By Owner contract Pennsylvania must include: 1. The Purchase Price, 2. This form recommended and approved for, but not restricted to use by, the members of the Pennsylvania Association of Realtors® (PAR). ASR. A Pennsylvania purchase agreement creates a secured contract for a residential property transaction. A Pennsylvania lease-to-purchase agreement is a contract deal between a landlord and a tenant. The tenant can rent a property and buy it later. A tenant has the right to receive a written notice from the landlord before the property is put up for sale.