Unilateral Promise to Sell vs. Option Contract: Transfer of Ownership Upon Acceptance

A plaintiff sought annulment of a sale based on a purported unilateral promise to sell, which the defendant argued was a mere option contract requiring acceptance to form the sale agreement, not an immediate transfer of ownership. The court affirmed the lower court's decision, reasoning that a unilateral promise to sell, even when stating that the sale would be perfected upon a simple acceptance by the beneficiary, does not transfer ownership instantly but rather constitutes a simple promise to contract; therefore, the sale is only definitively concluded upon the acceptance of the promisee, meaning the necessary agreement for transfer had not yet materialized at the time the claim was lodged.