Any use, building, or structure existing at the time of the enactment of this chapter may be continued even though such use, building or structure may not conform with the provisions of this chapter. No change of title or right of possession shall affect the continuation of an existing use. No existing building or premises devoted to a use not permitted by this chapter, except when required to do so by law or order, shall be enlarged, extended, reconstructed, substituted or structurally altered unless the use thereof is changed to a use permitted in this district. (Ord. C-405, 8-17-2004)