It shall be unlawful for an owner to use or permit the use of a building or premises or part thereof hereafter created, erected, changed, converted, restored, enlarged or moved, wholly or partly, in its use or structure, until a certificate of occupancy shall have been issued by the Code Enforcement Officer. Such certificate shall show that such building or premises or part thereof and the proposed use thereof are in conformity with the provisions of this chapter. It shall be the duty of the Code Enforcement Officer to issue a certificate of occupancy, provided that the building and the proposed use thereof conform to all the requirements herein set forth.