It is made the duty of every owner, occupant or agent of any building in the city, required to be numbered by the provisions of this chapter to put on such buildings now built, in a conspicuous place and next to the street on which it fronts, the proper number or numbers thereof. Such number or numbers shall be in figures not less than two inches in length and shall be placed on all buildings within ten days after the completion or occupation thereof. (Prior code § 4-4-12)