A Florida developer is building a massive, $29 million waterfront home that should end up being the first of its size to get a thumbs-up from the U.S. Green Building Council.

He didn’t skimp on amenities: The house will have eight bedrooms, 11 baths, two eleveators, two wine cellars and more. But it will also boast an extensive solar panel system, reflecting ponds and water gardens designed to cool the property and a water runoff collection system, and energy-efficient lighting.—Gregory Mone