Nonconforming Uses of Nonconforming Buildings. A nonconforming use of a nonconforming building may be expanded or extended throughout such building for a period of time as set forth provided no structural alterations are made therein except those required by law or ordinance. A nonconforming use of a nonconforming building may be changed to another use of the same or more restricted classification provided no structural alterations are made therein.

Nonconforming Uses of Conforming Buildings. A nonconforming use of a conforming building shall not be expanded or extended into any other portion of the conforming building. If such nonconforming use is discontinued or abandoned for a period of six months or more, any future use of such building shall be in conformity with the provisions of this Chapter. While such nonconforming use exists no additional use shall be permitted, even though such additional use would otherwise be a conforming use unless approved by the Commission by written resolution.