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Horace Burgess (in Tennessee) built a tree house, with a whopping 1,000 square meters (nearly 11,000 square feet) and standing 90 feet tall! It took fifteen years.

"there are places in which tree houses are a tradition like any other. Such traditional treehouse designs may not be as luxuriously accommodated as their architect-designed counterparts but they are well-planned in their own ways and are frequently far more eco-friendly as well."