Ponte City is a skyscraper in the Hillbrow neighbourhood of Johannesburg, South Africa. It was built in 1975 to a height of 173 m (567.6 ft), making it the tallest residential skyscraper in Africa. The 54-story building is cylindrical, with an open center allowing additional light into the apartments. The center space is known as "the core" and rises above an uneven rock floor. Ponte City was an extremely desirable address for its views over all of Johannesburg and its surroundings. The sign on top of the building is the largest sign in the southern hemisphere. It currently advertises the South African mobile phone company Vodacom.