No nonconforming building shall be enlarged or structurally altered except to make it a conforming building. A nonconforming use of a building existing at the time of the adoption of this chapter may be extended throughout the building provided no structural alterations except those required by this chapter or law are made therein.
(Ord. 552, passed - -62; Ord. 855, passed 10-7-86) Penalty, see § 10.99