Nothing in these rules, regulations, restrictions
or prohibitions shall be construed as changing the plans or uses of
present buildings or the construction, use or occupation of any building
for which a permit has been issued and the construction of such building
has been diligently prosecuted within three months after the date
of such permit.
A nonconforming building or structure employed
in a nonconforming use, except as herein otherwise provided, may not
be reconstructed or structurally altered to an extent exceeding in
aggregate cost 100% of the assessed value of such building or structure,
as such assessed value existed, unless said building is changed or
the use for which the same is to be employed is changed to a conforming
use.
A nonconforming use shall not be extended except
as above provided, but the extension of a lawful use to any portion
of a nonconforming building which existed prior the enactment of this
chapter shall not be deemed the extension of such nonconforming use.
Whenever a nonconforming use has been discontinued
for a period of one year, such use shall not thereafter be reestablished,
and any future use shall be in conformity with the provisions of this
chapter.
Whenever the boundaries of a district shall
be changed so as to transfer an area from one district to another
district of a different classification, the foregoing provisions shall
also apply to any nonconforming uses existing therein, and the effective
date for applying these provisions shall be the effective date of
the change of zone.