Zoning and Occupancy Permits shall be required for all buildings and structures hereinafter occupied, erected, constructed, altered, repaired or moved within or into any district established by this chapter and for the use of vacant land or for a change in the character of the use of land, within any district. No building permit shall be issued until the zoning clearance portion thereof has been completed by the Community Development Department and any required Site Plan, Use Permit or Variance has been issued and become effective. No Commercial or Industrial use may be occupied until clearance has occurred as to consistency with the provisions of the Municipal Code or any Site Plan, Use Permit or Variance granted.