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.

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Tour CB21
Tour CB21
General information
Type	Office
Location	La Défense (Courbevoie)
Coordinates	48°53′20.00″N 2°14′59.30″E
Construction started	1972
Completed	1974
Height
Antenna spire	187 m (614 ft)
Roof	179 m (587 ft)
Technical details
Floor count	44
Floor area	70,500 m2 (759,000 sq ft)
Design and construction
Architect(s)	Harrison & Abramovitz, J. P. Bisseuil
Website
www.cb21-ladefense.com?lang=en

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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]

• Skyscraper
• La Défense
• List of tallest structures in Paris

• Tour GAN (Emporis)
• CB21 Website (Covivio)