The authors of this 2020 report, architecture experts at Politecnico di Milano in Italy, write that quantifying building energy performance through the development and use of Key Performance Indicators (KPIs) is an essential step in achieving smart building goals in new and existing buildings. The analysis begins with an explanation of basic smart-building features and technologies and goes to propose a performance-indicators framework. Proposed KPIs are organized into nine groups. The research of interest from the perspective of intelligent buildings performance metrics.