The lawful nonconforming use of a structure, land or water 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; provided, however, that only the portion of the land or water 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.
A. 
Total lifetime structural repairs or alterations shall not exceed 75% of the equalized full assessed value of the structure at the time of its becoming a nonconforming use unless it is permanently changed to conform to the use provisions of this chapter.
B. 
Substitution of new equipment may be permitted by the Plan Commission if such equipment will reduce the incompatibility of the nonconforming use with the neighboring uses.
C. 
For the purpose of this chapter, a nonconforming use shall begin as of the time it was made nonconforming by the terms of a preceding ordinance, of this chapter, or of an amendment to this chapter.
A. 
If such nonconforming use is discontinued or terminated for a period of 12 months, any future use of the structure, land, or water shall conform to the provisions of this chapter. When a nonconforming use or structure is damaged by fire, explosion, flood, the public enemy, or other calamity to the extent of more than 50% of its current assessed value, it shall not be restored except so as to comply with the use provisions of this chapter.
B. 
In applying this section to damaged uses or structures, lots platted according to Ch. 236, Wis. Stats., and on record in the County Register of Deeds office before the effective date of this chapter need not be combined if, in the determination of the Zoning Administrator, the intent of the district will be maintained at the time of construction.
A lawful nonconforming structure existing at the time of the adoption or amendment of this chapter may be continued although its size or location does not conform to the lot width, lot area, yard, height, parking and loading, and access provisions of this chapter; however, it shall not be extended, enlarged, reconstructed, 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.
Once a nonconforming use or structure has been changed to conform, it shall not revert back to a nonconforming use or structure. Once the Plan Commission 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 Plan Commission.