11_diagonal_street | location | south_africa <tsp> south_africa | ethnicgroup | asian_south_africans <tsp> south_africa | capital | cape_town <tsp> south_africa | ethnicgroup | white_south_african <sep> 11 diagonal street is an office tower in johannesburg, south africa it was built in 1983 to a height of 80 metres it is designed to look like a diamond as it reflects different views of the central business district from each angle of the buildingthe building's architect was helmut jahn 
with the capital of cape town. south africa is the location of 11 diagonal street and has the ethnic groups of asian south africans and white south africans.11 diagonal street is an office tower in south africa south south