government, it was called the Brixton Tower. At present it is called the Sentech Tower. In 1964 the Johannesburg Botanical Garden was established in the suburb of Emmarentia. The Emmarentia Dam forms part of the Garden. The Garden is best known for its roses. The Rand Afrikaans University was founded in 1966. Its first campus was on the erstwhile premises of South African Breweries in Braamfontein, Johannesburg. Later it moved to its new campus in Auckland Park. The University of Johannesburg came into existence on 1 January 2005 as the result of a merger between the Rand Afrikaans University (RAU), the Technikon Witwatersrand (TWR) and the Soweto and East Rand campuses of Vista University. 1970 to 1979 The Standard Bank Centre is in Fox and Simmond Streets in central Johannesburg. During the excavation, three stories below ground level, they came across an old stope. It was part of the workings of the old Ferreira Mine. The building's foundations were stabilised by backfilling the No. 1 level of the workings with concrete grout, but part of the stope was preserved as a museum. The building was completed in 1970. It was constructed by first building a central core and cantilever arms and then suspending the floors from the arms. The Centre houses a renowned art gallery. The enormous Carlton Centre, built at a cost of R88 million, contained a fifty-storey office tower, the thirty-storey luxury Carlton Hotel, a five-storey Garlicks department store, three-and-a-half-acre public plaza with a two-story underground shopping centre beneath it and parking garages with space for 2000 cars. The Carlton Hotel (Johannesburg) opened for business on 1 October 1972. Ponte City is a skyscraper in the Berea neighbourhood, just next to Hillbrow. It was built in 1975 to a height of 173 m (567.6 ft), making it the tallest residential skyscraper in Africa. In 1971 the South African Broadcasting Corporation was eventually allowed to introduce a television service. When television was finally introduced, there was only one channel with airtime divided evenly between English and Afrikaans, alternating between the two languages. Test transmissions in Johannesburg began on 5 May 1975, followed in July by ones in Cape Town and Durban. Nationwide services finally commenced on 5 January 1976. In 1971 Parliament passed the Black Affairs Administration Act, No. 45 of 1971. In terms of this Act the central government appointed the West Rand Administration Board to take over