Assume you are a paralegal working for a real estate law firm. Your client comes to you with a written contract for purchase of real estate. The contract is for purchase of $5$ acres of a $10$ acre tract of land in Loxahatchee Florida. Your client, the buyer, tells you that after he and the seller signed the contract, the Seller told him that he could also buy the remaining $5$ acres if he wanted it$,$ as long as he let him know by March $1,2017.$ On February $15,2017$ your client called the Seller and told him that he decided to buy the other $5$ acres but the Seller told him he already signed a contract to sell those $5$ acres to someone else and therefore could not sell the property to him. Your client wants to sue the seller to force him to sell him the additional $5$ acres as promised.

Does your client have a claim?

Why or why not $($discuss the legal doctrine upon which you rely$)?$