This building is realised next to one of the main ancient doors of Siena. The plan has the same triangular shape of the area: on the eastside, the façade is tangential to the new road which leads to the different levels of the private parking. The westside is completely underground while the third side is looking to the open field of the valley. The building hosts multifunctional activities and its top is a public square at the road level. Only two “façades” are visible: the one, with the apartments, looking to the valley and the public square next to the ancient city wall.