No existing building or lot devoted to a use not permitted by this chapter 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:
(B) When authorized by the Board in accordance with the provisions of §§ 152.235 through 152.244, the extension of a use and the extension or completion of a building devoted to a nonconforming use may be made upon the lot occupied by such use and/or building or on a lot adjoining, provided that the adjoining 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.
(C) When authorized by the Board in accordance with the provisions of §§ 152.235 through 152.244, nonconforming use may be extended throughout those parts of a building which were 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.
(Ord., passed - -79; Am. Ord. 1980-5, passed 7-7-80) Penalty, see § 152.999