Nothing in this Chapter shall be construed to prevent the ordinary maintenance or repair of any exterior feature of any building or structure in an historical district, or of any historic property or landmark which does not involve a change in design, material, color or outer appearance thereof, nor to prevent the construction, reconstruction, alteration, restoration or demolition of any such feature of a structure, building or landmark when the Building Official shall certify such is required for the public safety because of an unsafe or dangerous condition. (Ord. 989, 4-23-2020)