Another was is a current owner they got an "COO" certificate of occupancy and maintened the flood insurance...and then the flood insurance is "transferable".......to you.
Otherwise it must meet new BFE (base flood elevations) which as best as I can tell vary a great deal ....by the local entity (county, and or different cities have their own) ...so a place across the bay could have a different requirement (i.e. Pass Christain, vrs Bay St Louis vrs Hancock Count)
What area is most desired for the Jordan River, we went and looked at some near the Bay itself, but i have heard others have plaes in Kiln.
18 ft above sea level is the FEMA reg. now. Some existing homes are grandfathered in if the damage is less than 50%, which means the house would not need to be raised.
I'll email you more details, other comps, etc...send me your address: firstname.lastname@example.org