11_diagonal_street | buildingstartdate | 1978 <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 
the building at 11 diagonal street was started to be erected in 1978.no information