Tower Plaza is a high-rise condominium building in Ann Arbor, Michigan, located at 555 East William Street. The building was first proposed in 1965, and opened in 1969. It stands at 26 stories. The antenna stands at 292 feet tall and the roof is 267 feet (81 m) tall. It was designed in the international style of architecture, primarily using concrete and glass. Originally a residential apartment building, it was converted to individually-owned condominiums in 1987. Tower Plaza also has the most buttons of any elevator in Ann Arbor.