Ponte City Apartments, Johannesburg, South Africa

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.
History
The principal designer of Ponte was Mannie Feldman, working in a team together with Manfred Hermer and Rodney Grosskopf. Rodney Grosskopff recalled the decision to make the building circular, the first cylindrical skyscraper in Africa. At the time, Johannesburg bylaws required kitchens and bathrooms to have a window, so Grosskopff designed the building with a hollow interior, allowing light to enter the apartments from both sides. At the bottom of the immense building were retail stores and initial plans were to include an indoor ski slope on the 32,000-square-foot (3,000 m2) inner core floor. The building was so tall because developers wanted a large number of units but only had limited land to build on. The building was located 35 minutes from the Jan Smuts International Airport (now called OR Tambo International Airport) and almost within walking distance of the innercity with theatres like the Market and the Civic within 5 km (3.1 mi).