The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. A For Sale By Owner contract New York must include: 1.The Purchase Price, 2. We've included a lengthy, typical NYC real estate purchase contract geared towards new development for your review below. What constitutes a complete offer submission? Some examples of documents you may need to sell your home are: Property survey: This is a legal document that shows the buyer the boundaries of your property.