The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. Intro to sales contracts and detailed description of NC Realtors 2-T Offer to PUrchase and Contract Due Diligence Fees and Periods.Com to register for classes! The listing firm is that is the exclusive right to sell. Seller shall sell and convey and Purchaser shall purchase the property, together with all buildings and improvements thereon (collectively the.