11 Diagonal Street
| 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″S 28°2′9″E / 26.20417°S 28.03583°E |
| Construction started | 1981 |
| Completed | 1983 |
| Opening | 1984 |
| Cost | R65 million |
| Owner | Rebosis Property Fund |
| 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) is an iconic office tower in downtown Johannesburg, South Africa, that was built by Anglo American Property Services. The 22 floor building is the 15th tallest in the city and it was conceptualized in 1981 and excavations began in December that year. Construction ended in 1983 and the building was tenanted in 1984. 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. 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.
The building's architect was Helmut Jahn and is featured on the Level 42 album cover The Very Best of Level 42.