The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. We'll make our choices, check the boxes and fill in the blanks.The purpose of this package is to assist you in the sale of your own home without the services of an attorney or a realtor. A For Sale By Owner contract New York must include: 1. The Purchase Price, 2. 1. Name the parties to the contract. The parties will include the buyer(s) and seller(s). Forms are state specific because real estate laws vary significantly from state to state.