View source for 11 Diagonal Street

{{Use dmy dates|date=April 2022}}
{{Infobox building
| name                = 11 Diagonal Street
| image               = 11 Diagonal Building.jpg
| caption             = A view of the building from street level
| location            = [[Johannesburg]], [[South Africa]]
| coordinates         = {{coord|26|12|15|S|28|2|9|E|region:US-SA|display=inline,title}}
| status              = Complete
| start_date          = 1981
| completion_date     = 1983
| official     = 
| opening             = 1984
| demolished_date     = 
| destruction_date    = 
| building_type       = Multi use, [[Office]]
| antenna_spire       = {{convert|80|m|abbr=on}}
| roof                = {{convert|75|m|abbr=on}}
| top_floor           = {{convert|75|m|abbr=on}}
| floor_count         = 20
| elevator_count      = 6
| cost                = R65 million
| floor_area          = {{convert|20000|m2|sqft|abbr=on}}
| architect           = Helmut Jahn
| structural_engineer = 
| main_contractor     = 
| developer           = 
| owner               = Rebosis Property Fund
<ref>https://www.rebosis.co.za/property-item/11-diagonal-street/</ref> 
| management    = 
}}

'''11 Diagonal Street''' (also known as the diamond building<ref>{{Cite web |date=2015-09-08 |title=The Diamond Building – Johannesburg, South Africa |url=https://aeworldmap.com/2015/09/08/the-diamond-building-johannesburg-south-africa/ |access-date=2025-04-06 |website=AEWORLDMAP.COM (3,300+ posts) |language=en}}</ref>) is an iconic [[Tower block|office tower]] in downtown [[Johannesburg]], [[South Africa]], that was built by Anglo American Property Services.<ref>11 Diagonal Street (1983) Published by Anglo American Property Services (Pty), Ltd., Johannesburg</ref> The 22 floor building is the 15th tallest in the city<ref>{{Cite web |date=2015-09-08 |title=The Diamond Building – Johannesburg, South Africa |url=https://aeworldmap.com/2015/09/08/the-diamond-building-johannesburg-south-africa/ |access-date=2025-02-19 |website=AEWORLDMAP.COM (3,300+ posts) |language=en}}</ref> and it was conceptualized in 1981 and excavations began in December that year. Construction ended in 1983 and the building was tenanted in 1984.<ref>{{Cite journal |date=January 1983 |title=Eleven diagonal street concrete won the day |url=https://journals.co.za/doi/abs/10.10520/AJA10212019_16842 |journal=Civil Engineering = Siviele Ingenieurswese |volume=1983 |issue=1 |pages=11–13 |doi=10.10520/AJA10212019_16842|doi-broken-date=1 February 2025 }}</ref> The building is designed to look like a [[diamond]] as it reflects different views of the [[Central Business District (Johannesburg)|Central Business District]] from each angle of the building.<ref>{{cite web|url=http://www.emporis.com/en/wm/bu/?id=11diagonalstreet-johannesburg-southafrica|archive-url=https://web.archive.org/web/20070208213034/http://www.emporis.com/en/wm/bu/?id=11diagonalstreet-johannesburg-southafrica|url-status=usurped|archive-date=8 February 2007|title=11 Diagonal Street, Johannesburg, South Africa|work=[[Emporis]]}}</ref> Apart from its 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.<ref>{{Cite journal |date=January 1983 |title=Eleven diagonal street concrete won the day |url=https://journals.co.za/doi/abs/10.10520/AJA10212019_16842 |journal=Civil Engineering = Siviele Ingenieurswese |volume=1983 |issue=1 |pages=11–13 |doi=10.10520/AJA10212019_16842|doi-broken-date=1 February 2025 }}</ref>

The building's architect was [[Helmut Jahn]]<ref>{{Cite web |title=Jahn |url=https://jahn.studio/ |access-date=2025-02-19 |website=Jahn |language=en-US}}</ref> and is featured on the [[Level 42]] album cover [[The Very Best of Level 42]].

==Current Use==
The building was used by the department of Development Planning & Local Government.<ref>{{Cite web |url=http://www.joburg.org.za/index.php?option=com_content&id=2855&Itemid=58 |title=Diagonal Street, with Neil Fraser |website=joburg.org.za |access-date=2014-10-26 |archive-url=https://web.archive.org/web/20141026151235/http://www.joburg.org.za/index.php?option=com_content&id=2855&Itemid=58 |archive-date=2014-10-26 |url-status=dead }}</ref> It is currently occupied by The Gauteng Department of Infrastructure Development.<ref>{{Cite web |last=Lebohang |title=11 Diagonal Street |url=https://www.rebosis.co.za/property-item/11-diagonal-street/ |access-date=2025-02-19 |website=Rebosis |language=en-ZA}}</ref>

==References==
{{Reflist}}

{{Greater Johannesburg|city}}
{{JoburgSkyscrapers}}

{{Authority control}}

[[Category:Office buildings completed in 1984]]
[[Category:Skyscraper office buildings in Johannesburg]]
[[Category:Helmut Jahn buildings]]
[[Category:20th-century architecture in South Africa]]
[[Category:Buildings and structures in Johannesburg]]

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