These are the hanging gardens @ the PAMM a few blocks away :
http://s3-media4.fl.yelpcdn.com/bpho...u-4FaO7g/o.jpg
The height is impressive for such a tiny lot on Flagler Street. As for the hurricane risk the hanging gardens can be stored & removed prior to a hurricane. It's not like Miami doesn't have a lot of roof top garden terraces & courts too.
I just wish the towers could be taller than 450 feet since they will practically have no views in the middle of the CBD.
^ If this lot was half a block east of it's current location it's Zoning could support a super tall up to 1,010 feet high but not sure it's lot size could @ only 17,065 square feet.
Either way having two 450 foot residential towers proposed in the heart of downtown is impressive given the low rise nature of Flagler Street.