Lone Madrone is a 1,600-square-foot vacation retreat located on a rocky, south-facing shoreline on Orcas Island, a horseshoe-shaped islet in the San Juan Islands archipelago off Washington state. The home’s green roof is landscaped with a variety of plants and vegetation that are both native and drought-tolerant, a feature that designers hoped would increase the biodiversity value of the area. The home, called Lone Madrone, is built for a family of four and is clad in wood.