Structures and their uses that are nonconforming may be continued so long as they otherwise remain lawful but shall not be enlarged, expanded or altered except to become more in conformity. Any replacement of a nonconforming structure shall conform to this chapter. Any nonconforming structure destroyed to an extent greater than 50% of its assessed valuation shall not be reconstructed except in conformity with this chapter. Changes from one nonconforming use to another are prohibited.

No nonconforming building shall be enlarged, extended or increased unless the use of the same is permitted in the district in which it is located and provided said enlargement, extension or increase by itself conforms with all requirements of this Zoning Chapter and the dimensions and setback of said enlargement, extension or increase, when aggregated with the existing building do not create or increase any dimensional or setback violation of this Zoning Chapter and provided further that the area of said enlargement, extension or increase, when aggregated with the area of the existing building, does not exceed the maximum lot coverage standard permitted in that zone or any other standard whatsoever established by this Zoning Chapter. Exception to yard depths are set forth in the Schedule referenced in Section 16-8 of this chapter.

Any nonconforming use or structure existing at the time of the passage of an ordinance may be continued upon the lot or in the structure so occupied and any such structure may be restored or repaired in the event of partial destruction thereof.