Seller shall sell and convey and Purchaser shall purchase the property, together with all buildings and improvements thereon (collectively the. I'm gonna break down all the terms and conditions so you can understand what it means and we're gonna fill that out so you can have a real-life example of it.With our free Sales Agreement form, you'll be ready to print or download your contract in no time. CONTRACT OF SALE – OFFICE, COMMERCIAL AND MULTI-FAMILY RESIDENTIAL. PREMISES.