Designed by French architectural firm Valode and Pistre, the T1 Tower is now complete. Situated in La Défense, the high-rise business district west of Paris, the tower has a floor area of 70,000 sq m and features restaurants, meeting rooms and underground parking to support the office space within.

Valode and Pistre describe the T1 as having been "conceived as a folded glass plate, 200 metres high, cut by an arc on its north face. The distinctive profile changes according to one’s vantage point and assures the tower’s insertion within the surrounding context.