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 Village Board 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 Village Board.