After Hurricane Sandy, FEMA announced they were increasing rates for flood plain houses up to 10x.

Wimauma is all loose, sandy, flats.

Also, I forgot to mention that I'm looking into the North Decatur upwards to the Dunwoody/Sandy Springs area.

Buried utilities are about $150 per linear foot, you could possibly depending on your soils not hook up sewer and go with a leech field or septic, those systems I believe are around $15000 to $20,000. 

Quote from @Sandy Hatch: I want to start investing in multifamily units, but my wife doesn't want to risk having personal liability for investment assets.

Tucker, Ga. area to the Sandy Springs and Dunwoody areas.

It looks like the heavy clay soils are holding the water under the house and it can't "leak" back out through the crawl foundation and footers (which look surprisingly good).

https://www.meetup.com/San-Die...Here is the meetup group :) 

They will bring in pets who will at best soil the carpets and floors and destroy the yard, and at worst bite or maul neighbors.  

Ask the builder, he should know plenty about this and have good local contacts for you as you'll likely need a survey, soil testing and more depending on your local requirements.