In addition to Portland’s green streets, this Oregon city now boasts of an amazing retrofit for a federal building, the General Services Agency, featuring green fins. The vertical gardens will shade a 200 foot high wall in spring and summer, using rooftop graywater. This reminds me of Suginami’s giant green curtain, but perhaps even more ambitious. According to the architects, Cutler Anderson, the building aims to be one of the most energy efficient buildings in the United States, if not the the world.