No land shall be occupied or used, and no structure erected, reconstructed or structurally altered shall be occupied or used, in whole or in part, for any purpose whatsoever, until a certificate of occupancy shall have been issued by a Code Enforcement Officer stating that the structure and use appear to comply with all applicable provisions of this Zoning Code. No change in any use shall be made to any structure or part thereof, except in conformance with a certificate of occupancy issued by a Code Enforcement Officer. Use of a single-family dwelling for a group home shall constitute a change of use requiring a certificate of occupancy. Any subsequent change of occupancy or reoccupancy of a group home shall also constitute a change of occupancy requiring a certificate of occupancy. A certificate of occupancy shall be applied for concurrently with the application for all approvals and, unless a temporary certificate of occupancy has been issued, shall be issued within 10 days after the lawful erection, reconstruction or structural alteration of such building shall have been completed.