Where the districts established by this chapter, or districts established by amendments that may later be adopted, contain structures and uses of land and structures that were lawful before this chapter was passed or amended; but which would be prohibited, regulated, or restricted under the terms of this chapter or future amendments, it is the intent of this chapter to permit these nonconformities to continue within the provisions of this article, but not to encourage their survival. See Article
XIII for required certificates of occupancy. Such uses and structures are declared by this chapter to be incompatible with permitted uses in the districts involved.
Nothing in this article shall be deemed to prevent the strengthening
or restoring to a safe condition of any structure or part thereof
declared to be unsafe by any official charged with protecting the
public safety, upon such order of such official.