Philippine National Bank Binalbagan Branch vs. Antonio Tad-y

The governing principle is that a mortgagee's acquisition of mortgaged property at a tax delinquency auction, when authorized by a general administration clause in the Real Estate Mortgage, inures to the benefit of the mortgagor. Upon full satisfaction of the secured obligation, the mortgagee retains the property only as a constructive trustee, and its refusal to reconvey constitutes constructive fraud under Article 1456 of the Civil Code. Furthermore, a defense of prescription cannot be invoked for the first time on appeal when the applicable prescriptive period is ambiguous on the face of the complaint and involves factual determinations that necessitate a full-blown trial.

Spouses Jose and Patricia Tad-y obtained agricultural sugar crop loans from PNB in 1975, securing the obligations with a Real Estate Mortgage over six parcels of land in Himamaylan City and Hinigaran, Negros Occidental. When two parcels became delinquent in real property taxes in 1988, PNB participated as the sole bidder in a provincial tax auction and acquired title. The spouses later restructured their accounts and fully paid the loans by 1996. PNB released the mortgage on four parcels but retained the two auctioned lots, asserting independent ownership. After years of failed negotiations for repurchase, the spouses filed an action for breach of contract and reconveyance in 2004. The trial court and the Court of Appeals ruled in favor of the spouses, prompting PNB to seek review before the Supreme Court.

• On January 30, 1975, and August 14, 1975, the spouses Jose and Patricia Tad-y obtained agricultural sugar crop loans from PNB totaling P172,000.00, secured by a Real Estate Mortgage (REM) over six parcels of land in Himamaylan City and Hinigaran, Negros Occidental.
• On August 9, 1988, due to unpaid real property taxes, the provincial treasurer of Negros Occidental sold Lots 778 and 788 at a public auction. PNB participated as the sole bidder and acquired the lots for P10,609.63. Final Bills of Sale were issued to PNB on August 23, 1989.
• In November 1995, the spouses restructured their loans under Republic Act No. 7202 and fully paid the obligations in 1996. PNB executed a Deed of Release of the REM on March 6, 1996, but deliberately excluded Lots 778 and 788, claiming ownership by virtue of the 1988 auction sale.
• Patricia Tad-y sent demand letters in 2001 and 2003 requesting the release of the lots and offering reimbursement for the auction price. PNB maintained its ownership but expressed willingness to negotiate a repurchase.
• On March 23, 2004, the Tad-ys filed a complaint for breach of contract and reconveyance before the RTC. The RTC ruled in their favor, holding that PNB abused its rights by allowing tax delinquencies to acquire the properties cheaply, and that PNB's purchase inured to the Tad-ys under an attorney-in-fact clause in the REM. The CA affirmed, imposing a constructive trust over the lots and rejecting PNB's prescription defense.

• Petitioner PNB argued that the defense of prescription was apparent on the face of the complaint and could be raised for the first time on appeal, citing Article 1144(1) or (2) of the Civil Code. It contended that the trial court should have dismissed the case motu proprio.
• PNB maintained that it had no contractual obligation to pay real property taxes under the REM, asserting that the duty to advance taxes arises only upon default and the initiation of judicial foreclosure, which never occurred.
• PNB argued that paragraph (d) of the REM, which constituted it as attorney-in-fact upon breach, only authorized acts of administration and foreclosure facilitation, not the acquisition of mortgaged property at a tax auction.
• PNB contended that the CA erroneously imposed a constructive trust, as its lawful acquisition of the lots at a public auction did not constitute actual or constructive fraud.

• Respondents maintained that PNB breached the REM by failing to advance tax payments as mandated by the mortgage contract, thereby enabling the tax delinquency and subsequent auction sale.
• Respondents argued that PNB's participation in the auction sale as the sole bidder constituted an actionable abuse of rights under Article 19 of the Civil Code, prejudicing the mortgagors.
• Respondents asserted that under paragraph (d) of the REM, PNB's automatic appointment as attorney-in-fact upon breach meant its acquisition of the lots inured to their benefit.
• Respondents countered that the action was not barred by prescription or laches, emphasizing that the complaint alleged the auction sale was void ab initio, which carries an imprescriptible right to challenge.

• Procedural Issues: Whether the affirmative defense of prescription can be raised for the first time on appeal when it was not pleaded in the trial court and the applicable prescriptive period is not clearly apparent from the pleadings.
• Substantive Issues: (1) Whether PNB breached the REM by failing to pay real property taxes on the mortgaged lots. (2) Whether the attorney-in-fact provision in paragraph (d) of the REM authorized PNB to acquire the lots at a tax delinquency auction on behalf of the mortgagors. (3) Whether a constructive trust was validly imposed over the disputed lots following full satisfaction of the secured loans.

• Procedural: The Court held that the defense of prescription could not be raised for the first time on appeal. Under Rule 9, Section 1 of the Rules of Court, unpleaded defenses are deemed waived unless prescription is clearly apparent from the pleadings or evidence. The Court found that the complaint alleged multiple theories carrying different prescriptive periods, making the applicable statute of limitations unclear. Furthermore, PNB's invocation of laches introduced factual disputes requiring evidentiary presentation, which deprived the trial court of its primary fact-finding function.
• Substantive: The Court ruled that PNB did not breach the REM by failing to pay taxes, as the obligation to advance taxes under paragraph (c) arises only in the context of judicial foreclosure, which was never initiated. However, the Court found that paragraph (d) automatically constituted PNB as the Tad-ys' attorney-in-fact upon their breach of mortgage conditions. The general power to perform acts "convenient for the proper administration of the mortgaged property" encompasses purchasing the lots at a tax auction to preserve the mortgagee's security interest. Consequently, PNB's acquisition inured to the benefit of the mortgagors. Upon full payment of the loans in 1996, the REM became functus officio. PNB's refusal to release the lots constituted constructive fraud, as an agent is estopped from asserting title adverse to the principal. The Court affirmed the imposition of a constructive trust under Article 1456 of the Civil Code, ordering reconveyance upon reimbursement of the auction price plus interest.

• Constructive Trust — A trust arising by operation of law, not by express agreement, to satisfy the demands of equity and prevent unjust enrichment when property is acquired through mistake or fraud. The Court applied this doctrine because PNB, acting as an agent under the REM's attorney-in-fact clause, acquired the lots to preserve its mortgage interest but refused to release them after the principal obligation was extinguished, thereby breaching its fiduciary duty.
• Agency in Real Estate Mortgages (Acts of Administration vs. Strict Dominion) — Power-of-attorney stipulations in mortgage contracts are customary mechanisms implementing Article 2087 of the Civil Code and pertain to acts of administration, not strict dominion. The Court applied this principle to hold that purchasing tax-delinquent mortgaged property at public auction to protect the mortgagee's security interest constitutes an act of administration, causing the acquisition to inure to the mortgagor's benefit.
• Waiver of Prescription as an Affirmative Defense — Defenses not pleaded in a motion to dismiss or answer are deemed waived. A court may dismiss a claim on prescription motu proprio only if the bar is unmistakably apparent from the face of the pleadings. The Court applied this rule to deny PNB's late invocation of prescription, noting the ambiguity of the applicable statute and the evidentiary nature of the laches defense.

• "The relations of an agent to his principal are fiduciary and it is an elementary and very old rule that in regard to property forming the subject-matter of the agency, he is estopped from acquiring or asserting a title adverse to that of the principal." — Cited from Severino v. Severino to emphasize that PNB, having purchased the lots as an agent to secure its mortgage interest, could not lawfully retain ownership after the debt was satisfied.
• "A constructive trust is one created not by any word or phrase, either expressly or impliedly, evincing a direct intention to create a trust, but one which arises in order to satisfy the demands of justice." — Quoted from the CA decision and affirmed by the Court to justify the imposition of a trust over the disputed lots due to PNB's constructive fraud and breach of fiduciary duty.

• Dino v. Court of Appeals — Cited to establish that prescription may be raised for the first time on appeal only when no new factual issue arises and the defense is clearly apparent on the record.
• Sanchez v. Sanchez — Followed to demonstrate that prescription is not apparent on the face of a complaint when factual disputes exist or when the nature of the contract affects the prescriptive period, necessitating a full trial.
• Garcia v. Villar — Relied upon to explain that power-of-attorney provisions in mortgage contracts are customary stipulations implementing Article 2087 of the Civil Code, intended to facilitate foreclosure rather than confer absolute ownership.
• Berico v. Court of Appeals — Cited to define constructive fraud as a breach of legal or equitable duty that the law declares fraudulent due to its tendency to injure public or private interests, irrespective of moral guilt.
• Severino v. Severino — Applied to hold that an agent is estopped from acquiring or asserting title adverse to the principal, forming the basis for the constructive trust imposed on PNB.

• Article 1144(1) & (2) of the Civil Code — Discussed regarding the ten-year prescriptive period for actions upon a written obligation and constructive trust, but deemed inapplicable due to unclear pleading and waiver.
• Article 1374 of the Civil Code — Invoked to mandate that contracts must be interpreted as a whole, guiding the Court's reading of the REM's tax payment and attorney-in-fact clauses.
• Article 1456 of the Civil Code — Applied to establish the constructive trust, providing that a person acquiring property through mistake or fraud is deemed a trustee by operation of law.
• Article 1877 & 1878 of the Civil Code — Referenced to distinguish between acts of administration (general agency) and acts of strict dominion (requiring specific authority), classifying PNB's auction purchase as an administrative act.
• Article 2052 & 2087 of the Civil Code — Cited to define the essence of a mortgage as a security contract allowing alienation of the property for debt payment upon maturity.
• Rule 9, Section 1 & Rule 16 of the Rules of Court — Applied to rule that the defense of prescription is waived if not pleaded, unless it is unequivocally apparent from the record.