Answer: Statute of Frauds
Step-by-step explanation:
The Statute of Frauds requires that real estate sales be conducted in writing instead of via oral agreement and since the lawyer and the owner had only an oral agreement, the courts would most likely side with the owner.
The lawyer can argue under the Principle of Part Performance (an exception to the Statute of Frauds) that his actions in renovating the place were consistent with someone who had an agreement to buy the place but the owner could argue that the lawyer's actions were simply those of a leasee improving the conditions of the place he is renting. This would bring the courts on the side of the owner.