Your home might be cozy, but nothing compares to the fun of a childhood treehouse. Hazel Road Residence combines modern home design with treehouse vibes to showcase the best of both worlds. Completed by Oakland-based firm Buttrick Projects Architecture+Design, this project transformed a 1950s residence into a gorgeous family home with sustainable features. Located in Berkeley, California, this house began its life in 1952 as a 1,714-square-foot structure.