I love this city.
“…the center’s photovoltaic roof array will generate as much energy as the building uses. A huge rainwater filtration system will collect and filter every bit of rain that falls. Five gigantic composting bins process “matter” from the toilets, and the structure itself was built using completely non-toxic materials—a rarity in construction.”
Quote from this article: http://gizmodo.com/5995202/one-of-the-worlds-greenest-commercial-building-opens-today
And more about the Bullitt Center: http://bullittcenter.org/