Hearst Tower was designed by the architect Norman Foster. It is New York’s first green building, having been designed to use 26% less energy than the minimum requirements for the city of New York, and earned a gold designation from the U.S. Green Buildings Council’s LEED (Leadership in Energy and Environmental Design) certification program, becoming New York City’s first LEED Gold skyscraper.The new Hearst tower was built on top of the original Hearst headquarters building in 1928.The original cast stone facade has been preserved in the new design as a designated landmark site.The Hearst Tower is the first office tower in North America to use a diagonal grid (diagrid) construction rather than vertical steel beams. This configuration reduces the total steel required by approximately 20%, contributing to the building’s sustainability credentials. Other design features focus on low energy requirements and water conservation. About 85% of the original 6-story structure was re-used or recycled during the construction of the tower.