Pretty much all of Florida has a high water table. The Florida aquifer is giant limestone cavern that is underneath much of Florida. Huge cities pump millions of gallons of water out of it daily. This adds to the naturally occurring sinkhole problems.From what I have read it's likely a sinkhole and foundation problem. It's built in an area with a high water table.
One article I read said it was a predominately Jewish neighborhood?Lots of comments under several articles I read said it looked like demolition charges. If so (nothing would surprise me at this point), I wonder if it might eventually come out just who lived there that might have been the target.