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Exterior, Cabin Building Type, House Building Type, and Treehouse Building Type The three-story Blue Lake Retreat is located in Marble Falls, Texas. The residence was designed by Lake Flato Architects to integrate naturally into the steep topography. With living spaces on the top floor and four bedrooms on the two lower floors, the timber structure is connected to the hillside by a bridge and boasts a cantilevered deck that floats just above the lake.  Best Photos from Escaping to This Lakeside Retreat Would Be Like Living in a Tree House