Steve Ross Luria, left, Patricia Braynon and Ario Lundy tour the green house. JOHN VANBEEKUM / MIAMI HERALD STAFF

The exterior of the green house, with impact windows, is shaping up. JOHN VANBEEKUM / MIAMI HERALD STAFF

Architect Steve Ross Luria demonstrates the technology for the insulated concrete wall. JOHN VANBEEKUM / MIAMI HERALD STAFF

Tangelia Sands JOHN VANBEEKUM / MIAMI HERALD STAFF