Specific Performance of Unilateral Promise to Sell Following Subsequent Sale

The case concerned a dispute over a promise to sell, where the promisee sought specific performance after the promisor sold the property to a third party, despite the promisee having fulfilled all conditions precedent, including payment. The court overturned the lower court's decision, reasoning that the unilateral promise to sell, once accepted and its conditions satisfied by the beneficiary, forms a commutative contract, and thus the promisor's subsequent sale to another constitutes a breach of that contract, entitling the beneficiary to a judgment declaring the sale null and void and ordering the transfer of ownership based on the prior agreement.