Any improvement or maintenance to any structure or site feature shall not cause the site or building to become non-compliant with the regulations set forth in this Ordinance. If the site or building is already non-compliant, the change to the building or site proposed by the owner shall not cause them to become more non-compliant. In such instances, improvements shall be completed in a manner which makes the building, site, or related items more substantially compliant with the current provisions of this Ordinance than was previous to the improvements. Any improvement proposed to modify the size of a building, lot, parking area, etc. shall be submitted for review by the City. If the proposed improvement(s) modify the size of a building or lot by less than 30%, it shall be submitted for review by City staff and approved or disapproved by an Administrative Official. The Administrative Official shall have the authority to require such a project be reviewed by the Planning and Zoning Commission and City Council if they feel such review is warranted. If the proposed change is in excess of 30% in size, it shall be submitted for full review and approval or disapproval by the Planning and Zoning Commission and City Council.