The city of Santiago, Chile needed to find a sustainable solution to urban land use for the transformation of the North-South highway that divides the city center. Veolia, through its subsidiary 2EI, participated in a 3D simulation project to design a sustainable urban landscape for Santiago. The simulator is an innovative tool that allows numerical modeling of the territory in 3D and evaluation of urban proposals for environmental and social benefits. The outcome was an effective tool to consolidate the urban vision, present the project, aid decision making, and compare options for assessing sustainable solutions.