The 55-story, 2.1-million-square-feet Bank of America headquarters tower in New York City was the first commercial skyscraper to earn the Platinum designation back in May 2010. Designed by Cook + Fox Architects, it uses a high-performance glass curtain wall to maximize sunlight within the interior while keeping out excessive heat. A cogeneration plant an ice storage system help cut down on peak energy usage, while the tower reuses almost all of the rainwater and sink water captured by its water conservation systems. (Photo courtesy of Bank of America)