The Geo Donar was made out of leftover cherry hardwood taken from the owner's house remodel in San Diego, California and then covered in a recycled HDPE canopy. The dome is totally water-tight and zips up with marine zippers, and the exit is reached with a basket powered by an electric winch pulley system. It's has a 14 foot diameter.

Bamboo Tripod

Here is yet another unique treehouse design we’ve never seen before and this one only has a footprint of 80 square feet. The platform of this treehouse and bridge is supported with a tensegrity tripod made of bamboo. It has two hanging platforms connected with ropes and ladders so the kids in Venice, California can swing back and forth. A catwalk leads into a dense bamboo forest – the ultimate sanctuary.

Mulholland Slat Treehouse

The Mulholland Slat Treehouse is definitely unique. It was made from 70 vertical slats of FSC certified wood and then fashioned into a 10 foot cylindrical structure that was set 20 feet high in a live Oak tree. The sweep of the treehouse mimics the surrounding valley’s shape and permits slivers of moonlight at night through the slats.

Lotus

These two lotus treehouses were pre-fabricated on site before they were installed around a live oak tree using a circular tube that supports cables tied to the tree’s branches. One of the structures is 8 foot in diameter and the other is 10 feet and they are connected by a cable car that provides quick transportation between them. They were made with sustainably-sourced materials.