For zoning lots in flood zones with single- or two-family detached residences utilizing the provisions for cottage envelope buildings, as defined in Section 64-11 (Definitions), the provisions of this Chapter pertaining to minimum lot area, lot width, and minimum sizes of front yards and side yards shall not apply, and in lieu thereof, the underlying district regulations shall apply for the purposes of determining the applicability of the definition of cottage envelope buildings, and the particular amount of relief permitted pursuant to Section 64-33 (Cottage Envelope Buildings), inclusive.