Section 17
SEC. 17. When an order declaring a slum area shall have become effective, the Commission shall have concurrent jurisdiction with the government of the city or municipality in which the slum is situated to adopt building and sanitary regulations with the same powers as such city or municipality might have with respect thereto; but such regulations shall in general follow the existing municipal ordinances if an adequate sanitary and building code or regulations be in force, and shall not be less exacting than those of the city or municipality concerned. In case of conflict, the President of the Philippines shall determine which regulation shall prevail.