SUMMARY
The valorization processes of real estate capital are strongly influenced by the ability of the different buildings to capture and incorporate some liquidity flows, this capacity, is closely related to the dynamics of the market, of its segments and the single building. The study proposes in this regard, a new methodology, warranting a continuity process with some traditional economic and evaluation approach, using some new tools, such as the developed rough set by the Operations Research for other issues, but, in this case, that have an instrumental role for the identification of the capacity to increase in value of a real estate capital and to propose a fuzzy measure of this capacity. The study case is that of the market of Ortigia, the historic center of Syracuse.