This eco-estate on 20 acres in Topanga, Calif., features a two-story treehouse with Moroccan-inspired décor. Tree houses aren't just for kids. Christiana Wyly had long dreamed about living in the forest when she moved to Topanga Canyon. And her dream came true when she met a designer named Roderick Romero, who actually built tree houses for the likes of Sting, Val Kilmer, Julianne Moore and Donna Karan. The Topanga Tree House is not only whimsical and beautiful, it's environmentally…
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