It shall be unlawful for any owner to use or permit the use of any building or part thereof hereafter erected, altered, converted or enlarged wholly or in part or transferred until a certificate of occupancy shall have been issued by the Construction Official. An application for a certificate of occupancy may be made by an owner, tenant, purchaser under contract or the legal representative of any of said persons. The certificate shall show that the building or part of a building and the proposed use conform to the requirements of this article and other applicable ordinances. It shall be the duty of the Construction Official to issue a certificate of occupancy only when he is satisfied that the building or part of a building and the proposed use thereof so conform. Occupancy permits shall be granted or denied, in writing, within five days from the date that a written request for the same is filed with the Construction Official.