No building hereafter erected, converted or structurally altered shall be used, occupied or changed in use and no land may be used until a Certificate of Occupancy and Compliance shall have been issued by the Building Inspector of the Town of Highland Park stating that the building or proposed use of land or building complies with the provisions of this ordinance and other building laws of the Town of Highland Park. Provided that this provision shall not apply to alteration of structures which remain occupied during construction, so long as all applicable ordinances and building standards of the Town of Highland Park are complied with.