For some time now, following the constitutional reform, the debate on the metropolitan city has been reignited. The topic has been at the centre of attention given that cohesion policies attribute to metropolitan cities a key role in planning and the constitutional reform seems to have given an answer to the spending review which wipes out the provinces and formally identifies the European Strategy under the form of a programmatic suitability of intermediate metropolitan level. This level should counterbalance the municipal egoism which provides a distorted interpretation of subsidiarity which has marked planning since the revising of Title V. Very few are acquainted with the implications and complexities of these entangled mechanisms which will fail if all conditions are not met whether they be effective, nominal or opportunity related. This explains why the term Metropolitan City is preferred to conurbation, agglomeration or metropolitan area. Metropolitan Area and City do not coincide the area is in a portion of territorial recognition which entails attractive and competitive factors, the city is identified as such only if within the territorial organization that explains why the creation of both must be ensured: the city must be promoted in terms of competition, with or without a demographic dimension, by fostering the shared political project and by creating relational and productive conditions to attract and offer services and what else is necessary. What makes the difference is how to build and what to build. The strategy and the role of the future Metropolitan City of Reggio Calabria and Messina stem from two different regulations and from the attempt to integrate interregional functions through the project I put forward: the strategic corridor platform of the Straits area. The platform is a non-confined territorial dimension which encompasses the two metropolitan cities and shares relational functions and understandings with the vast territory. It fully exploits the possibilities and available reforms in order to organize and provide the territory with competitive and functional dimensions so as to compete in Europe and in the Mediterranean. The prototype-project, the first part of the study has already been published, fosters an idea of governance and urban system which will devise, through future cohesion policies and multidimensional strategies, a single strategic vision of the territory able to dialogue at a local and Euro-Mediterranean level with the new scale economies and meet the challenges of 2020-2050. Without going into detail, the project proposes and organizes the intangible functions of the Area (new assets and networking) so as to satisfy the demand for services and infrastructures physical and non-physical (functional and international indicator).