Co-Ownership and Unauthorized Sales: Property Rights Under Article 493

The Supreme Court's 2003 decision in Coronel v. Constantino (G.R. No. 121069) clarifies a fundamental rule of Philippine property law: a co-owner may sell only their own undivided share, and such a sale does not bind the other co-owners. The case also addresses when silence can—and cannot—be treated as ratification of an unauthorized sale. For anyone holding property with relatives or business partners, the ruling offers essential guidance on what a valid sale requires.

Facts of the Case

The dispute involved two parcels of land in Hagonoy, Bulacan, originally owned by Honoria Aguinaldo. Upon her death, one-half of the property passed to her daughter Emilia Meking Vda. de Coronel and her three sons: Benjamin, Catalino, and Ceferino. The other half went to Florentino Constantino and Aurea Buensuceso.

In 1981, Emilia executed a "Kasulatan ng Bilihang Patuluyan" (Deed of Absolute Sale) covering the property. The document named Emilia and Benjamin as sellers, but only Emilia signed it. Benjamin's signature was absent. The buyers, Jess Santos and Priscilla Bernardo, later sold their rights to Constantino and Buensuceso.

When the Coronels began constructing improvements on the property, Constantino and Buensuceso sued for declaration of ownership and quieting of title. The trial court ruled in their favor, declaring them sole owners of the entire property. The Court of Appeals affirmed, reasoning that the three sons had ratified the sale through their inaction and silence.

The Issue

The central question was whether Emilia's sale of the co-owned property was valid and binding on her co-heirs, particularly regarding their shares. The Supreme Court also examined whether the sons' failure to act amounted to ratification.

The Ruling

The Supreme Court partially reversed the lower courts. It held that Emilia's sale was valid only as to her own share in the co-owned property. The sale could not transfer the shares of Benjamin, Catalino, or Ceferino, none of whom signed the deed.

The Court relied on Article 493 of the Civil Code, which states that each co-owner has full ownership of their part and may alienate, assign, or mortgage it. However, the effect of such alienation is limited to the portion that may be allotted to that co-owner upon partition.

Since the deed clearly showed that only Emilia's share was sold—Benjamin did not sign, and the other sons' shares were not mentioned—the buyers acquired only Emilia's undivided interest. The Court declared Constantino and Buensuceso owners of one-half of the property plus Emilia's one-fourth share, while Benjamin and the heirs of Catalino and Ceferino retained one-fourth each.

Why Silence Was Not Ratification

The Court of Appeals had applied Articles 1317 and 1403(1) of the Civil Code, which make contracts entered into by an unauthorized person unenforceable unless ratified. The appellate court found that the sons ratified the sale through inaction.

The Supreme Court disagreed. Citing Maglucot-Aw v. Maglucot, the Court explained that ratification requires a voluntary choice, knowingly made, to adopt an unauthorized act. There was no evidence that the sons even knew about the sale. Without knowledge, their silence could not be interpreted as ratification. The Court also noted that no proof showed the sons benefited from the sale proceeds.

Practical Takeaways

• A co-owner sells only their own share. Under Article 493, a sale by one co-owner transfers only that person's undivided interest, not the shares of others.
• Get all co-owners to sign. A deed signed by only one co-owner is unenforceable against the others. Verify that every co-owner executes the document.
• Ratification requires knowledge. Silence or inaction does not amount to ratification unless the person knew of the unauthorized act and voluntarily chose to accept it.
• Buyers should check ownership carefully. Purchasers of co-owned property should confirm that all co-owners have consented, or they risk acquiring only a partial interest.
• Partition remains available. When shares are undefined, the parties can still seek judicial or extrajudicial partition to determine each owner's specific portion.

The case underscores a protective principle: co-ownership does not give any single owner authority over the whole. Each co-owner's right is confined to their own share, and any sale beyond that is simply ineffective as to the other owners.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.