Johannesburg instance of financial centre
Architecture and urbanism
Johannesburg is home to some of Africa's tallest structures, such as the Sentech Tower, Hillbrow Tower, the Carlton Centre and Ponte City Apartments. The Johannesburg city skyline has most of the tallest buildings on the continent and contains most international organisations such as IBM, Absa, BHP, Willis Group, First National Bank, Nedbank and Standard Bank. Many of the city's older buildings have been demolished and more modern ones built in their place. North of the CBD is Hillbrow, the most densely populated residential area in southern Africa. Northwest of the CBD is Braamfontein, a secondary CBD housing many offices and business premises. The CBD is predominated by four styles of architecture, being Victorian Colonial, Edwardian Baroque, Art Deco and Modernism.
The city is often described as Africa's economic powerhouse, and contentiously as a modern and prosperous African city. Johannesburg, like many metropolises, has more than one central business district (CBD), including, but not limited to, Sandton, Rosebank and Roodepoort in addition to the original CBD.  Some tend to include Benoni and Germiston as well.
Due to its many different central districts, Johannesburg would fall under the multiple nuclei model in human geography terms. It is the hub of South Africa's commercial, financial, industrial, and mining undertakings. Johannesburg is part of a larger urban region. It is closely linked with several other satellite towns. Randburg and Sandton form part of the northern area. The east and west ridges spread out from central Johannesburg. The Central Business District covers an area of 6 square kilometres (2 sq mi). It consists of closely packed skyscrapers such as the Carlton Centre, Marble Towers, Trust Bank Building, Ponte City Apartments, Southern Life Centre and 11 Diagonal Street.
Johannesburg's city centre retains its elements of a rectangular grid pattern that was first officially recorded in 1886. Streets are narrow and filled with high rises built in the mid- to late 1900s. Old Victorian–era buildings first built in the late 1800s have been torn down long ago. The 1900s brought along with it the introduction of many different architectural styles and structures. The Johannesburg Art Gallery and Supreme Court Building being two examples. These were important Beaux-Arts structures, with the style put in place by (at the time) colonial parent, the British Empire. South Africa didn't borrow architectural techniques exclusively from Britain, however. They were also inspired by American models and styles, having built several structures like the ESKOM Building and the Corner House to emulate the prowess of New York City, located in the United States.
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