San Francisco Treehouse. A treehouse build 7.6 meters up in an 125-year-old coast live oak. Recycled, reclaimed and vintage materials have been used in the making. The whole construction has been put up in the tree without using any bolts or nails; therefore, not damaging the tree. The treehouse is truly magical because of its rustic interior and small details reminding of childhood. Located in Burlingame, San Francisco Bay, CA.