No existing building or lot devoted to a use not permitted by this Zoning Ordinance in the district in which such building or lot is located, 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 the district in which such building or premises is located, and except as follows.
(a) Substitution or Extension. When authorized by the Board of Zoning Appeals, in accordance with the provisions of Chapter 1131, the substitution for a nonconforming use of another not more objectionable nonconforming use or an extension of a nonconforming use may be made, but not both a substitution and an extension.
(b) Extension Upon Adjoining Lot. When authorized by the Board in accordance with the provisions of Chapter 1131, the extension or completion of a building devoted to a nonconforming use upon the lot occupied by such building or on a lot adjoining, provided that such lot was under the same ownership as the lot in question on the date the use of such building became nonconforming, and where such extension is necessary and identical to the existing use of such buildings
(c) Extension Inside Building. When authorized by the Board in accordance with the provisions of Chapter 1131, a nonconforming use may be extended throughout those parts of a building which are manifestly designed and arranged for such use prior to the date when such use of said building became nonconforming, if no structural alterations, except those required by law, are made therein.
(d) Nonconforming Use Made To Conform. Whenever a nonconforming use has been changed to a conforming use, such use shall not thereafter be changed to a nonconforming use.
(Ord. 12-1966. Passed 10-10-66.)