A. 
The lawful nonconforming use of a structure or land, including but not limited to fences, parking and zoning setbacks, existing at the time of the adoption or amendment of this chapter may be continued although the use does not conform to the provisions of this chapter. However, only that portion of the land in actual use may be so continued, and the structure may not be extended, enlarged, reconstructed, substituted, moved or structurally altered except when required to do so by law or order or so as to comply with the provisions of this chapter.
B. 
If no structural alterations are made, a nonconforming use of a building may be changed to any use permitted in the same use district as that in which the use existing is permitted according to the provisions of this chapter, provided that when a use district is changed, any existing nonconforming use in such changed district may be continued or changed to a use permitted in the same use district as that in which the existing use is permitted, provided that all other regulations governing the new use are complied with.
C. 
Substitution of new equipment may be permitted by the Zoning Board of Appeals if such equipment will reduce the incompatibility of the nonconforming use with the neighboring uses.
A. 
Discontinuance. If the nonconforming use of a building or premises is discontinued for 12 months, any future use of the building or premises shall conform to the regulations for the district in which it is located. A reasonable interim between tenants or occupants shall not be construed to mean discontinuance.
B. 
Extensive repair must be in conformance. At such time as structural repairs, reconstruction or alterations are made to nonconforming structures or premises, which repairs or alterations exceed 50% of the equalized assessed value of such structures or premises as established by the City Assessor, such structures or premises will be required to conform to the use restrictions of this chapter.
Once a nonconforming use or structure has been changed to conform, it shall not revert back to a nonconforming use or structure. Once the Zoning Board of Appeals has permitted the substitution of a more restrictive nonconforming use for an existing nonconforming use, the substituted use shall lose its status as a legal nonconforming use and become subject to all the conditions required by the Zoning Board of Appeals.