Montréal Downtown is actually composed of three spatially and functionally distinct nuclei, which are respectively the Business District, the so called "institutional axis" and the Old Montréal. In this paper, the authors elaborate three options for planning and redeveloping Montréal Downtown. They analyse the economic, social and urban planning impacts of those proposals, as well as their conditioning factors. The three options are: 1) integration, by restoring the spatial continuity of the urban fabric as well as of the social and economic activities, in order to give a new unity to the whole sector; 2) differentiation, which would strengthen the relative autonomy of each three nuclei, in order to have more complementarity between them; 3) figuring out a "mesh-like" structure between the nuclei, in order to bridge the existing gaps between them and promote a socio-economic as well as spatial organization that would result in a network.