11 Diagonal Street is an office tower in Johannesburg, designed by Helmut Jahn. Anglo American Property Services built it, and Rebosis Property Fund owns it. It was conceived in 1981, excavation began in December 1981, and it was completed in 1983 and tenanted in 1984. The article names no style. It says the building was designed to look like a diamond, reflecting different views of the Central Business District from each angle.
It is built of concrete rather than steel, a choice presented as faster and cheaper. The roof is 75 meters high and the antenna spire reaches 80 meters. Floor area is 20,000 square meters, and the cost was 65 million rand. The article gives 20 floors in the infobox and 22 in the text.
It is the 15th tallest in Johannesburg. It appears on the cover of the album The Very Best of Level 42. The Gauteng Department of Infrastructure Development occupies it.
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