Rest easy in the Oaktagon Tree House of 1 Big Sustainable Island. This off the grid (no electricity) one-of-a-kind home is perched on a 14 acre, semi-private island 1/2 mile from shore on a Maine lake. The 900 sq. ft. octagonal home, built around a living Red Oak tree, is designed to make your stay comfortable, relaxing, and soothing. The setting has the sights & sounds of the best that Maine's natural beauty has to offer: fresh air, clean water, the sounds of loons on a quiet lake.