On completion in 2023, the 62-story Winthrop Center in Boston is slated to become the world's largest office building to pursue Passive House certification. Existing LEED Platinum buildings in Boston use 60 percent more energy than Winthrop Center's office space is projected to, and a typical Class A building in Boston's existing stock uses 150 percent more energy than Winthrop Center's office space is expected to use. EXACTING STANDARDS 38 URBAN LAND WINTER 2023