One of the main attractions in Sandton is Sandton City, which ranks among the largest shopping centres in Africa. The completion of this precinct by the Liberty Group was the catalyst for the subsequent development of this entire area. Together with Nelson Mandela Square, the centre, with some 144,000 m2 of shopping space, is one of the largest in the Southern Hemisphere (behind Chadstone Shopping Centre). Much of Johannesburg’s business tourism is centred on Sandton, which has various 5-star hotels under the Southern Sun, Hilton, Radisson and Protea brands.