| Tour CB21 | |
| Location: | La Défense (Courbevoie) |
| Coordinates: | 48.8889°N 2.2498°W |
| Start Date: | 1972 |
| Completion Date: | 1974 |
| Building Type: | Office |
| Antenna Spire: | 187m (614feet) |
| Roof: | 179m (587feet) |
| Floor Count: | 44 |
| Floor Area: | 70500m2 |
| Architect: | Harrison & Abramovitz, J. P. Bisseuil |
Tour CB21, formerly Tour Gan, is an office skyscraper located in La Défense, the high-rise business district situated west of Paris, France. It was designed by celebrated American architect Max Abramovitz.
Built from 1972 to 1974, the tower is 179 m (587 ft) tall at roof height. However, it reaches 187 m (614 ft) once including the antenna located on the roof. It was the second tallest building in Paris upon its completion. Its ground shape is in the form of a Greek cross.
In 1972, during construction, a protest campaign opposed the building of Tour Gan. Protesters demanded a reduction in height. However, the tower was completed at the planned height.
Today, the main tenants are Suez Environnement and AIG France.
The structure is owned by Fonciere des Regions.[1]