Smart city is an abstract projection of the community of the future, an application and a conceptual perimeter defined by a set of needs that find answers in technologies, services and applications that can be traced to different domains: smart building, inclusion, energy, environment, government, living, mobility, education, health, and much more. These technologies, services and applications do not constitute either individually or collectively a smart city, if they are not integrated into a platform that ensures interoperability and coordination, but above all the definition of appropriate tools for governance and financing, essential elements for the implementation of the political and social vision constituting the smart city. As a vital component of the smart city, smart buildings can foster energy efficiency and the reduction of CO2 emissions in the atmosphere by guaranteeing the correct illumination, ventilation, cooling rate, along all aspects of building demands in real-time. Monitoring and sensing solutions combined with simple high-efficient methods against overheating (as main cause for high-energy consumption in buildings, in south European and north African countries) such as shading systems, free and ground-cooling are the protagonists of advanced sustainable building technology.