Fueled by big data and powerful computing, advanced algorithms have been explored and limitedly applied to smart buildings and communities to enhance building performance (energy efficiency, energy flexibility, and climate resiliency). This talk presents how open data, data models, and data tools can be used to create datasets compliant with FAIR principles, and how such datasets together with metadata models and advanced algorithms can provide insights into building operations and controls to support building decarbonization at scale. A few examples from recent DOE-funded projects will be presented and discussed.