for instance the value of an agricultural plot of land rises dramatically if it receives a building permit the key point is that this urban profit is created discretionally depending only on landuse planning criteria therefore this added value should not go into the hands of the private sector but be redistributed and used for the public good in catalonia s urban system there is a minimum public participation in the uiban profits established by law green spaces and streets with all its infrastmctures systems needed sanitation electricity and water supply are built and paid by real estate developers in addition the public administration will receive a portion of land where it will be able to build up to of the permitted square meters free of charges