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Erica Hogan shakes her head in amazement every day at what she and her husband, Matt Hogan, have set into motion. Both in their early 30s, they have fairly normal day jobs. She is the associate editor for the Crested Butte News in Colorado. He sells roofing made of recycled tires.

An Oklahoma City native whose parents, Dan and Dianne Andrews, still live in Oklahoma City, Erica Hogan met her husband during college in Colorado. They recently celebrated their fifth wedding anniversary.

At first glance, the Hogans seem like an average young couple. But this couple is far from average.

When they are not at work, the Hogans stay busy planning and building Finca Bellavista, the world's first sustainable tree house subdivision in the southern rain forest of Costa Rica.

These tree houses are a far cry from the backyard tree houses in every child's dreams. The Finca Bellavista tree houses can be suspended hundreds of feet up from ancient trees and come complete with rainwater-catch plumbing and hydroelectric power. They are completely self-sustainable, with bio-digester composting toilets and central distribution centers for the fresh artesian water.

Matt Hogan, an avid surfer, first fell in love with the southern region of Costa Rica during a surfing trip with friends. He insisted that Erica Hogan also fly down to see the area.

"We went down there with the intentions of buying a little fixer-upper surf shack, and we fell in love with this property that had all these waterfalls and swimming holes on it,” he said. The question was, once they built their surf shack, how would they use the rest of the property's 62 acres?

"Do you remember, in ‘Return of the Jedi,' the Ewok village?” Erica Hogan asked her husband after first touring the property. "Why couldn't we build something like that?”

"We started doing some research on it and realized that there was a pretty good market for tree houses,” Matt Hogan said. There are a