What's the tallest building in Africa?

Anyone have any idea what the tallest building in africa is? The I would also like to be able to have a picture of it relative to the surrounding city. I want to be able to show a booming commercial aspect of Africa.

I am not sure if there are taller buildings in Egypt or Nigeria, but in South Africa the tallest building is the Carlton Office complex.

For picture, see http://www.cjp.co.za/

As a picture of commercial success, this is not a good example .. the centre of Johannesburg is suffering from the same fate as many big cities were in the eighties .. a migration of commerce from the crime-ridden central city areas to the relative safety of the suburban or high-tech areas.