A few years ago in central Florida, John Santarpia had an idea. He was the president and CEO of a credit union and felt he needed to do something to improve its image. He and his colleagues had found a lot in Lakeland, a city of about 100,000 residents, with an ice cream shop on it. Knowing the community wouldn't be in favor of losing the ice cream shop, Santarpia decided to build a flagship building for his credit union around it. Whatever it was, he wanted to make it green. What resulted was the state's first commercial net-zero-energy building.