11 Diagonal Street

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11 Diagonal Street
11 Diagonal Building.jpg
A view of the building from street level
11 Diagonal Street
General information
StatusCompleted
TypeMulti use, Office
Location Johannesburg, South Africa
Coordinates 26°12′15″S28°2′9″E / 26.20417°S 28.03583°E / -26.20417; 28.03583
Construction started1981
Completed1983
Opening1984
CostR65 million
OwnerRebosis Property Fund [1]
Height
Antenna spire80 m (260 ft)
Roof75 m (246 ft)
Top floor75 m (246 ft)
Technical details
Floor count20
Floor area20,000 m2 (220,000 sq ft)
Lifts/elevators6
Design and construction
Architect(s)Helmut Jahn

11 Diagonal Street is an iconic office tower in downtown Johannesburg, South Africa, that was built by Anglo American Property Services. [2] The 22 floor building is the 15th tallest in the city [3] and it was conceptualized in 1981 and excavations began in December that year. Construction ended in 1983 and the building was tenanted in 1984. [4] The building is designed to look like a diamond as it reflects different views of the Central Business District from each angle of the building. [5] Apart from it's unique exterior, the structure was built with concrete instead of steel, demonstrating that concrete could be used instead of steel in both speed and cost. [6]

The building's architect was Helmut Jahn. [7]

Current Use

The building was used by the department of Development Planning & Local Government. [8] It is currently occupied by The Gauteng Department of Infrastructure Development. [9]

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References

  1. https://www.rebosis.co.za/property-item/11-diagonal-street/
  2. 11 Diagonal Street (1983) Published by Anglo American Property Services (Pty), Ltd., Johannesburg
  3. https://aeworldmap.com/2015/09/08/the-diamond-building-johannesburg-south-africa/
  4. "Eleven diagonal street concrete won the day". Civil Engineering = Siviele Ingenieurswese. 1983 (1): 11–13. January 1983. doi:10.10520/AJA10212019_16842 (inactive 1 February 2025).{{cite journal}}: CS1 maint: DOI inactive as of February 2025 (link)
  5. "11 Diagonal Street, Johannesburg, South Africa". Emporis . Archived from the original on 8 February 2007.
  6. "Eleven diagonal street concrete won the day". Civil Engineering = Siviele Ingenieurswese. 1983 (1): 11–13. January 1983. doi:10.10520/AJA10212019_16842 (inactive 1 February 2025).{{cite journal}}: CS1 maint: DOI inactive as of February 2025 (link)
  7. https://jahn.studio/
  8. "Diagonal Street, with Neil Fraser". joburg.org.za. Archived from the original on 26 October 2014. Retrieved 26 October 2014.
  9. https://www.rebosis.co.za/property-item/11-diagonal-street/