Philippine National Bank vs. Office of the President

P.D. 957 (The Subdivision and Condominium Buyers' Protective Decree) applies retroactively to real estate mortgages executed prior to its enactment because the law's purpose—to protect innocent lot buyers from unscrupulous developers—constitutes a valid exercise of police power that prevails over the constitutional prohibition against impairing the obligation of contracts.

Private respondents were installment buyers of individual lots in a subdivision developed by Marikina Village, Inc. Unbeknownst to them, the developer mortgaged the entire subdivision property to petitioner Philippine National Bank (PNB) in December 1975. After the buyers had substantially paid for their lots and constructed houses thereon, the developer defaulted on the mortgage. PNB foreclosed and, as the highest bidder at the auction sale, became the owner of the property. PNB then sought to dispossess the lot buyers or compel them to pay anew for their lots, arguing that P.D. 957, enacted in July 1976, did not apply to its pre-existing mortgage contract.

• Nature of the Parties and Transaction: Private respondents were buyers on installment of individual subdivision lots from developer Marikina Village, Inc. Petitioner PNB was the mortgagee of the entire subdivision property.
• The Mortgage and Foreclosure: On December 18, 1975, the developer mortgaged the lots to PNB. After the developer defaulted, PNB foreclosed the mortgage and, as the highest bidder at the public sale, acquired ownership of the property.
• Buyers' Status: The private respondents had complied with their installment obligations and had constructed houses on their respective lots, unaware of the existing mortgage.
• PNB's Claim: As the new owner, PNB sought to dispossess the buyers or compel them to pay the full purchase price again, arguing that P.D. 957 (enacted July 12, 1976) could not retroactively apply to its mortgage contract.
• Administrative Rulings: The HLURB and the Office of the President consistently ruled in favor of the lot buyers, applying P.D. 957 and ordering PNB to accept the buyers' remaining amortizations.

• Non-Retroactivity of P.D. 957: Petitioner argued that the Office of the President erred in applying P.D. 957 because the subject mortgage was executed on December 18, 1975, prior to the law's enactment on July 12, 1976. Citing Article 4 of the Civil Code, it maintained that laws should have no retroactive effect unless expressly provided.
• Lack of Privity: Petitioner contended it was a "total stranger to the land purchase agreements" between the buyers and the developer. Invoking Article 1311 of the Civil Code (relativity of contracts), it argued it could not be compelled to assume the developer's obligations under those contracts.

• Retroactive Application for Social Justice: Respondents, including the Solicitor General, countered that P.D. 957 was intended to apply retroactively to protect innocent lot buyers. The law's preamble and its purpose as an instrument of social justice and police power necessitated its application to pre-existing contracts to prevent a loophole that would perpetuate fraud.
• Bank's Duty of Due Diligence: It was argued that PNB, as a large financial institution, had the resources to conduct due diligence and should have been aware that the mortgaged property was a subdivision with houses already built by installment buyers. The buyers, in contrast, were powerless to discover the hidden mortgage.
• Specific Provisions Mandate Application: Respondents pointed to Sections 20, 21, and 23 of P.D. 957, which by their terms have retroactive effect, imposing obligations on developers regarding sales made prior to the decree's effectivity.

• Retroactivity of P.D. 957: Whether P.D. 957 should be applied retroactively to a real estate mortgage executed prior to its enactment.
• Privity and Obligation of the Mortgagee-Bank: Whether PNB, as the mortgagee and subsequent owner at foreclosure, can be compelled to accept the installment payments from the lot buyers despite the absence of contractual privity with them.

• Retroactivity of P.D. 957: The retroactive application of P.D. 957 is justified. The law's unequivocal intent, as gleaned from its preamble, is to protect innocent subdivision lot buyers from fraudulent practices. This purpose constitutes a valid exercise of police power, which prevails over the non-impairment clause of the Constitution. The Court emphasized that the law must be construed to give life to its intent, and a prospective-only application would create an illogical loophole for fraud.
• Privity and Obligation of the Mortgagee-Bank: PNB's defense of lack of privity fails. Section 18 of P.D. 957 explicitly grants the lot buyer the option to pay installments directly to the mortgagee, who must apply such payments to reduce the mortgage debt secured by the specific lot. The law itself creates this obligation, superseding the general rule on privity of contracts. PNB was therefore legally bound to accept the buyers' payments.

• Retroactive Application of P.D. 957 as Police Power — A statute enacted under the state's police power may be applied retroactively to modify or invalidate prior contracts if its purpose is to protect public welfare. P.D. 957, designed to shield subdivision buyers from unscrupulous developers, falls squarely within this principle. Its retroactive application does not violate the constitutional prohibition against impairing the obligation of contracts because the contract is deemed to have been entered into with knowledge of the state's inherent police power.
• Protective Mantle Doctrine for Subdivision Buyers — P.D. 957 provides a "protective mantle" over helpless citizens who may fall prey to fraudulent subdivision sellers. The law is construed liberally in favor of lot buyers to achieve its social justice objectives. Financial institutions dealing with subdivision properties are presumed to have conducted due diligence and are held to a higher standard of care.

• "The intent of a statute is the law. If a statute is valid it is to have effect according to the purpose and intent of the lawmaker. The intent is the vital part, the essence of the law, and the primary rule of construction is to ascertain and give effect to the intent." — Citing Sutherland on Statutory Construction, used to justify giving effect to the protective intent of P.D. 957.
• "Little people who have toiled for years through blood and tears would be deprived of their homes through no fault of their own." — Illustrating the social justice rationale underpinning the Court's decision.
• "The impairment clause is now no longer inviolate... As long as the contract affects the public welfare one way or another so as to require the interference of the State, then must the police power be asserted, and prevail, over the clause." — From Justice Isagani Cruz's commentary, adopted by the Court to explain the limitation on the non-impairment clause.

• Ongsiako vs. Gamboa, 86 Phil. 50 (1950) — Cited for the principle that the intent of the legislature is the law itself and must be enforced when ascertained.
• Juarez vs. Court of Appeals, 214 SCRA 475 (1992) — Followed for the ruling that the police power may validly limit the non-impairment clause when public welfare is involved.
• Breta and Hamor vs. Lao, et al., CA-G.R. No. 58728-R (1981) — A Court of Appeals decision with similar facts, cited persuasively for its protection of small homeowners against a mortgagee bank. The Supreme Court adopted its reasoning by reference.

• Presidential Decree No. 957 (The Subdivision and Condominium Buyers' Protective Decree) — Specifically, Sections 18, 20, 21, and 23 were central. Section 18 obligates a mortgagee to accept direct installment payments from a lot buyer. Sections 20, 21, and 23 were cited as having explicit retroactive effect, imposing obligations on developers for sales made before the decree.
• Article 4, Civil Code — Cited by petitioner for the general rule against retroactivity of laws, but distinguished by the Court based on the police power exception.
• Article 1311, Civil Code — Cited by petitioner on the relativity of contracts (privity), but held inapplicable because P.D. 957 itself creates a statutory obligation between the buyer and the mortgagee.

Chief Justice Andres R. Narvasa, Justice Hilario G. Davide Jr., Justice Jose A. R. Melo, and Justice Flerida Ruth P. Romero (per the list in the decision; Justice Santiago M. Kapunan was also a member of the Third Division at the time but is not listed in the concurring note).

N/A — The decision was unanimous.