Occupancy permit required. No new structure, new use of land, water or air or change in the use of land, water or air shall hereafter be permitted and no structure or part thereof shall hereafter be located, erected, moved, reconstructed, extended, enlarged, converted or structurally altered without an occupancy permit. No zoning permit shall be required for alterations which do not involve any change of use or change in the exterior which does not affect gross floor area or extensions into any side yard, front yard or rear yard setbacks. Such permit may be consolidated with a building permit request and issuance; no building permit will be issued prior to issuance of an occupancy permit.