CONTRACT OF SALE – OFFICE, COMMERCIAL AND MULTI-FAMILY RESIDENTIAL. PREMISES. Basic business terms appear only in the first few pages.Less important terms appear later. We've included a lengthy, typical NYC real estate purchase contract geared towards new development for your review below. THIS PURCHASE AND SALE AGREEMENT (this "Agreement") is made as of this ____ day of. NYC Real Estate Purchase Contracts can be far more complex than the standardized purchase forms used in other states. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.