Any building which is nonconforming due to insufficient yard
distances or lot area shall not be considered a nonconforming use.
Any alterations or structural changes may be accomplished within the
existing frame of said building, but any additions shall conform to
the specific setback and yard distance requirements of this chapter.
The use of any such nonconforming building may be changed to any other
permitted use so long as the yard or lot area requirements are no
greater.