Texas Land Contract Template. A Texas land contract establishes terms binding the parties in the sale of vacant land.PARTIES: The parties to this contract are. (Seller) and. (Buyer). How do I make a land sale agreement? The TREC unimproved property contract is one of the most important contract forms in Texas. But do you know when to use it? A Texas residential purchase agreement outlines the terms and conditions of an offer to purchase real estate.