According to campus policy, all new buildings and major renovations must meet or exceed LEED Silver standards. In 2007, MIT registered three new construction projects for LEED certification, including the new Sloan School of Management building that is expected to achieve a LEED Gold rating. Renovation programs focused on extensive retrofitting of heating, lighting, and water systems improve efficiency and conservation. Since 1990, MIT’s water use was reduced by 60 percent through low-flow plumbing and other efficiency installations.