Nothing in this Article shall be construed to prevent ordinary maintenance or repairs which do not involve a change of design, materials, or outward appearance of a building or structure in an historical preservation district; nor to prevent the construction, reconstruction, alteration, or demolition of any such feature which is required by the public safety because of an unsafe or dangerous condition. The requirements of this article do not apply to work which was begun or for which a permit was issued prior to the establishment of the historic preservation district. (Ord. 1280. Passed 8-24-04.)