Exterior, Wood Siding Material, Cabin Building Type, Treehouse Building Type, and Tiny Home Building Type A mere 172 square feet, the treehouse in the hills of Brentwood in Los Angeles was designed by Rockefeller Partners Architects, Inc. as a refuge, gallery and guest cottage  Photo 8 of 10 in 10 Surreal Tree Houses That Will Make Your Childhood Dreams Come True from An Atypical Tree House