The Bill & Melinda Gates Foundation is known for working diligently to improve lives around the world, but did you know its headquarters is also a paragon of sustainable design? The new campus in downtown Seattle was completed in March of 2011 and yesterday it was awarded with a LEED-NC Platinum Certification, making their 639,860 sq ft campus the largest certified non-profit building in the world. NBBJ led the design team, who equipped the building with 2 acres of living roofs, 1 million gallons of rainwater storage, solar systems and a long list of sustainable design strategies. >>>