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. 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. The following real estate forms are available for viewing and downloading in multiple formats. Model License Agreement for Office Space.