The Greenest Building: How the Bullitt Center Changes the Urban Landscape takes readers on a private tour through the profoundly game changing Bullitt Center, the first Class A commercial office structure in the world designed and engineered to meet the rigorous demands of the Living Building Challenge. The book begins with Part I, the contextual backstory of the Bullitt Foundation and its transition from a family based philanthropic organization to an influential ecological grant maker led by noted environmental pioneer Denis Hayes. Part II summarizes how designers, engineers, and builders engaged with forward-thinking regulators, lenders, and community members in a combined effort to create an extraordinary building that stands for what is possible in the urban built environment. Part III contains vivid details of how the project team approached and achieved the Imperatives of all seven Living Building Challenge Petals: Site, Water, Energy, Health, Materials, Equity, and Beauty. Part IV condenses the performance reports that earned the Bullitt Center its Living Building certification. The Greenest Building goes deep inside the Bullitt Center and its numerous innovations, one performance area Petal at a time.