Nothing in this chapter shall be construed to prevent ordinary maintenance or repair of any structure within any district; provided, such work involves no change in the exterior appearance of a structure. Nothing in this chapter shall be construed to prevent the construction, reconstruction, alteration or demolition of any feature that in the view of the proper authority acting lawfully is required for the public safety because of an unsafe or dangerous condition. (Ord. 2017-01 (part), 2017: prior code § 7727)