Except as otherwise provided in this chapter, any lawful nonconforming use, building or structure may continue; provided, however, that such use, building or structure shall not be altered, enlarged or otherwise expanded to increase the nonconformity of such area that does not comply to the current code. As used in this section, the term "enlarged" shall include, but not be limited to, an increase in the floor area, building area or portion of a lot or premises used for or occupied by the use; and the term "expanded" shall include, but not be limited to, any increase in volume, size, hours of operation or any other parameter of measurement of a nonconforming use, building or structure.

Any nonconforming use, building or structure which is diminished in volume, size, hours of operation, floor area, building area, portion of a lot or premises used for or occupied by said use, or in any other parameter of measurement of such use, building or structure, shall not thereafter be increased in such previously reduced aspect or parameter unless such increase is permitted by the provisions of this chapter in effect at the time of such increase.