 For example, the Oak Ridge City Center, a shopping center built in the 1950s and converted to an indoor shopping mall in the 1980s, sat largely empty in the years leading to its eventual partial demolition  and redevelopment.The city operates a preschool, four elementary schools enrolling kindergarten through grade 4, two middle schools enrolling grades 5 through 8, and one high school enrolling grades 9 through 12.In an August 2004 referendum, city voters approved an increase in local sales taxes to fund a $55 million project for Oak Ridge High School.