Rescission of Property Sale Due to Failure to Execute Final Deed

The dispute arose from a contract for the sale of property where the buyer failed to execute the final deed despite receiving the keys and possessing the property, leading the seller to seek rescission of the sale and repossession. The appellate court affirmed the trial court's decision granting the rescission, finding that the failure to execute the deed constituted a fundamental breach of the purchase agreement, as the transfer of full legal ownership was not achieved. The Court of Cassation upheld this ruling, reasoning that the delivery of the keys and possession did not substitute for the mandatory execution of the authentic act required for the definitive transfer of title under the governing law, justifying the contractual remedy sought by the seller.