| 11 Diagonal Street | |
|---|---|
 A view of the building from street level | |
 | |
| General information | |
| Status | Completed |
| Type | Multi use, Office |
| Location | Johannesburg, South Africa |
| Coordinates | 26°12′15″S28°2′9″E / 26.20417°S 28.03583°E |
| Construction started | 1981 |
| Completed | 1983 |
| Opening | 1984 |
| Cost | R65 million |
| Owner | Rebosis Property Fund [1] |
| Height | |
| Antenna spire | 80 m (260 ft) |
| Roof | 75 m (246 ft) |
| Top floor | 75 m (246 ft) |
| Technical details | |
| Floor count | 20 |
| Floor area | 20,000 m2 (220,000 sq ft) |
| Lifts/elevators | 6 |
| Design and construction | |
| Architect(s) | Helmut Jahn |
11 Diagonal Street (also known as the diamond building [2] ) is an iconic office tower in downtown Johannesburg, South Africa, that was built by Anglo American Property Services. [3] The 22 floor building is the 15th tallest in the city [4] and it was conceptualized in 1981 and excavations began in December that year. Construction ended in 1983 and the building was tenanted in 1984. [5] 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. [6] 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. [7]
The building's architect was Helmut Jahn [8] and is featured on the Level 42 album cover The Very Best of Level 42.
