Willis and Leslie orally agree to the sale of a parcel of land for $50,000:

Willis and Leslie orally agree to the sale of a parcel of land for $50,000: one-half payable now as a down payment; one-half payable in 30 days at the time of closing when the title will be transferred. The buyer, Willis, is to have possession immediately. Willis pays Leslie $25,000, takes possession of the land, and starts building a house. At the time of closing, Willis has made a substantial beginning on the house. However, Leslie refuses to transfer the title, claiming the oral contract is not enforceable. This contract is: