[Ord. No. 77-1, § 2; Ord. No. 82-30, § 4; Ord. No. 85-12, § 17]
Nothing in this chapter shall be interpreted to prevent ordinary maintenance or repair of any building substantially occupied by a nonconforming use, and structural alterations may be made in such a building, when necessary in the interest of public health, safety, convenience or appearance, except in a historic preservation district, all such structural alterations which would affect the exterior of the structure and would be visible from a public way in the district shall be subject to the standards and criteria set forth in section B17A-193A. In granting any permit for such alterations, the development enforcement officer shall file a written statement indicating the precise reason why such alterations were deemed necessary.