A selection of judgments and pronouncements shows the role of urban planning law, in t terms of local autonomy, discretion t technique, legal certainty, proportionality and good administration in favor of the future quality of our urban and architectural environments, and which includes, among others, the case of the theater of Sagunto (Giorgio Grassi and Manuel Portaceli), the library of the University of Seville (Zaha Hadid) or the Cloister of Los Jerónimos (Rafael Moneo).