The energy consumption of the building is 50% less than a typical skyscraper. The building is able to achieve this because of the "diagrid" structure, a grid of diagonally interlocking steel elements used in its construction. Each successive floor is offset so that a spiral atrium is created. Overall six shafts are created by gaps in each floor that serve as a ventilation system. The shafts allow the office space to be insulated with a thin layer of air, similar to the principle of double glazing. Warm air is circulated out of the building during the warmer months and into the building during winter.