This paper seeks to set out some hypotheses and ideas with regard to the relationship between: the historical centre, as a public space, and large urban projects, in the sense that the historical centre is a public space par excellence and, therefore, is an element around which the city is articulated; that converts it ? over and above all else - into a large urban project (GPU in Sp.) This proposition takes place in the optimistic context of the city as a solution and when considering the historical centre as an object of desire. The importance of historical centres is rooted in the possibility of preserving and making the most of memory ? to generate feelings of identity by function and belonging ? and of this being converted into a platform of innovation for the city as a whole. Therefore it is important to have a social subject as the conscious will (planning). What is important is the construction of a single government of public character (transparent, legitimate and representative) which is capable of taking on this right. This is why all this is more a projection and object of desire than of reality.