Structures existing in any identified floodplain area prior
to the enactment of this chapter may continue, subject to the following
provisions:
A. Any modification, alteration, reconstruction, or improvement of any
kind to an existing structure, to an extent or amount of 50% or more
of its market value, shall constitute a substantial improvement and
shall be undertaken only in full compliance with the provisions of
this chapter.
B. Any modification, alteration, reconstruction, or improvement of any kind to an existing structure or use within the AE Area/District, regardless of cost, shall comply with the requirements of §
300-99F(4)(e)[5] and §
154-401C of this chapter.