Tour Gan was designed in a modernist architectural style, measures 179 metres at the roof top and has 44 floors. With its antenna, however, the height rises to 187 metres, making the building the third tallest skyscraper in Paris. Its ground shape in the form of the Greek cross allows for an uninterrupted view from the windows for a maximum number of people.
The building was designed by a prominent American architect Max Abramovitz. In 1972, during construction, a protest campaign was launched against Tour Gan, which was thought to be too tall and thus too visible from the historical centre of Paris and from the Champs-Elysées in particular. Protesters demanded a reduction in height. Those protests, however, had no effect and the tower was completed at the planned height. After the planned renovation the tower’s energy consumption should be reduced by 30% and 5,334 window panels will be replaced: this will additionally improve the tower’s heating performance by 50%. Thus, tower should obtain HQE (High Environmental Quality) and BREEAM (Building Research Establishment Environmental Assessment Method) certificates.