It shall be unlawful for an owner to use or permit the use of any building or premises or part thereof, hereafter created, changed, converted or enlarged, wholly or partly, until a certificate of occupancy, which shall be a part of the building permit, shall have been issued by the Building Inspector. 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 Ordinance. It shall be the duty of the Building Inspector to issue a certificate of occupancy provided that he has checked and is satisfied that the building and the proposed use thereof conform with all the requirements of this Ordinance and the Building Code. No permit for excavation or construction shall be issued by the Building Inspector before he is satisfied that the plans, specifications, and intended use conform to the provisions of this ordinance.