La Défense is Europe’s biggest Business District that is now under a “Renewal Plan” in the goal to adapt to today’s needs and comply with sustainable development objectives. The D2 Tower is the first tower in La Défense to enable 30% of material economy through its sophisticated steel exo-structure. D2 is a symbol of sustainable development. The D2 Tower is first of all an urban project; it transforms the current ring road into a urban boulevard where life can be resettled. Its implementation erases the fracture between the Esplanade and the road; people come and go easily both night and day via its galleries, brasserie, restaurants, and new circulation lanes.At the top of its 170 meters height, its open-air top “Clouds’garden” under the canopy gives a thrining sens of well being at the heart of Paris’s business district.