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.
However, it reaches 187 m (614 ft) once including the antenna located on the roof.
In 1972, during construction, a protest campaign opposed the building of Tour Gan.
Today, the main tenants are Suez Environnement and AIG France.