BENGUET MANAGEMENT CORPORATION, PETITIONER, VS. COURT OF APPEALS, KEPPEL BANK PHILIPPINES, INC., AS TRUSTEE FOR METROPOLITAN BANK AND TRUST COMPANY, UNITED COCONUT PLANTERS BANK, RIZAL COMMERCIAL BANKING CORPORATION, FAR EAST BANK AND TRUST COMPANY AND BANK OF THE PHILIPPINE ISLANDS UNDER THE MORTGAGE TRUST INDENTURE, AND THE REGISTER OF DEEDS OF CALAMBA, RESPONDENTS