Title
Diampoc vs. Buenaventura
Case
G.R. No. 200383
Decision Date
Mar 19, 2018
Petitioners lent property title to respondent for a loan, later alleging forced signing of a deed of sale. SC upheld the deed, citing petitioners' negligence in not reading the document before signing.

Case Summary (G.R. No. 87880)

Key Dates

  • May–July 2000: Agreement to use owner’s duplicate TCT as collateral; promise of P300,000 share
  • July 2, 2000: Petitioner forced to sign folded document
  • November 19, 2002: Survey of property reveals half sold to respondent for P200,000
  • December 20, 2007: RTC decision dismissing petition
  • February 21, 2011: CA decision affirming RTC
  • May 6, 2011: CA resolution denying motion for reconsideration
  • March 19, 2018: SC decision

Applicable Law

  • 1987 Philippine Constitution
  • Civil Code provisions on contracts (Art. 1159: force of law; Art. 1358: formality of public document)
  • Rules on public vs. private instruments and presumption of regularity

Factual Background

Petitioners alleged ownership of the subject property and that respondent borrowed their owner’s duplicate title as loan security. They contended respondent promised P300,000 from the loan proceeds but instead caused them to sign a folded paper without opportunity to read it. Later they discovered a notarized deed of sale conveying half the property to respondent for P200,000. Barangay conciliation failed. Petitioners prayed for annulment of the spurious deed, cancellation of its annotation on TCT No. 25044, return of the duplicate title, and damages. Respondent denied fraud, asserted a valid sale, and invoked presumption of regularity of the public document.

RTC Decision

The Regional Trial Court found petitioners failed to overcome the prima facie evidence of a public deed of sale. Witness testimonies showed they signed but did not read the deed and received no payment, yet public-document presumption prevailed. The court ruled that terms of a notarized contract are conclusive; parol evidence cannot vary it. Civil Code Art. 1159 binds parties to their contracts. The complaint was dismissed for insufficiency of evidence.

Court of Appeals Decision

The CA affirmed. It emphasized that notarized instruments enjoy a presumption of regularity rebuttable only by clear, convincing, and more-than-preponderant evidence. Educated parties cannot claim ignorance of the word “vendor” nor blame poor lighting for failure to read. Even if illiterate, they were negligent in not having the contract explained. Defects such as a single community tax certificate or absence of the notary as witness do not vitiate validity but at most the evidentiary weight. Parol evidence must be clear and convincing, which petitioners failed to present. The CA denied the appeal and subsequent motion for reconsideration.

Issues on Appeal

A. Whether the CA erred in applying the presumption of regularity to a deed of sale allegedly notarized with irregularities.
B. Whether the CA erred in upholding the validity of the contract of sale despite claims of fraud and absence of real consent.

Petitioner’s Arguments

  • The deed was not signed before the notary and notarized in petitioners’ absence.
  • Only one community tax certificate was used for both spouses.
  • Respondent did not produce the notary public to testify.
  • Petitioners were deceived into signing a secured-loan authorization, not a deed of sale.
  • No proof of payment of the P200,000 consideration.

Supreme Court Ruling

  1. Notarization Defects Do Not Void Sale
    – Under Civil Code Art. 1358, lack of public formality affects only evidentiary weight, reducing a deed to a private instrum

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