A lawful use or structure existing at the time this ordinance is adopted or amended may continue even though such use does not conform with the district regulations subject to the following provisions:

A.

Whenever a nonconforming use or structure has been changed to a more restricted or conforming use, it shall not be changed back to a less restricted use.

B.

When the use of a building is nonconforming as defined by this ordinance and such a building is damaged by a fire, explosion, act of God, or the public enemy to the extent of more than 60 percent of its fair market value, it shall not be restored except in conformity with the provisions of the district in which the building is located.

C.

When a nonconforming use or structure is discontinued for a period of one year, the city council may adopt, after notice by certified mail to the property owners, an amortization schedule to bring about the gradual elimination of such nonconforming use.

D.

Any nonconforming use may be extended throughout any part of a structure which was arranged or designed for such use previous to the adoption of this ordinance, but shall not be extended outside such structure.

E.

No existing nonconforming use or structure shall be enlarged, moved, or structurally altered except to change to a permitted use. This is not to include normal repairs and maintenance which do not enlarge, move or structurally alter a nonconforming use.

Nonstandard uses existing immediately prior to the effective date of this ordinance may be continued, although such uses do not conform to the provisions hereof. Nonstandard buildings or structures may be enlarged or extended, converted, reconstructed, or structurally altered as follows:

A.

Enlargements, extensions, conversions, or structural alterations may be made as required by law or ordinance.

B.

Structural alteration of buildings or structures may otherwise be made if such changes do not encroach into an existing front yard, side yard, or rear yard which is less than the minimum required yards for the district in which they are located.

C.

Enlargement, extension, conversion of buildings or structures may otherwise be made if such changes comply with the minimum required yards, lot area, height, landscaping, parking, and density for the district in which they are located.