Urban blight in the context of "Johannesburg CBD"

The Johannesburg Central Business District, commonly called Johannesburg CBD, is one of the main business centres of Johannesburg, South Africa. It is the densest collection of skyscrapers in Africa, however, due to white flight and urban blight, many of the buildings are unoccupied as tenants have left for more secure locations in the Northern Suburbs, in particular Sandton and Rosebank. There are significant movements to revive the area.