A residence which is determined to be nonconforming within the zoning district in which the residence is located may be continued and is exempted from the provisions of these sections.

A nonconforming use of land which exists when this chapter [appendix] becomes effective may be continued provided that:

A.

No such nonconforming use of land shall in any way be expanded or expanded by more than 50 percent of existing building area, and must satisfy screening requirements found in section 4.12.

B.

If such nonconforming use of land or any portion thereof is discontinued of changed, any future use of such land shall be in conformity with the provisions of this chapter [appendix].

Any building which houses a nonconforming use which has been destroyed or damaged by fire, explosion, or Act of God, may be restored to the same nonconforming use as existed before such damage. No such restored use may be enlarged or expanded beyond the physical size which existed at the time of destruction or damage.

Any nonconforming use of land or building (except residential dwellings) which has become vacant or remains unoccupied owing to abandonment or discontinuance for a period of 12 months shall thereafter conform to the provisions of this chapter [appendix].

There may be a change in tenancy, ownership or management of a nonconforming use.