A. Any part of a structure occupied by an existing legally established and continued nonconforming use may be changed to a use which, in the opinion of the planning director, is of the same or of a more restrictive nature. When the use of a nonconforming structure is hereafter changed to a more restrictive use, the structure shall not thereafter be used for a less restrictive use.

B. There may be a change of tenancy, ownership or management of any existing legally established and continued nonconforming use provided there is no change in the nature or character of such nonconforming use except as authorized within this chapter. (Ord. 4229 § 2, 1987.)