To address energy use and emissions in existing buildings, several jurisdictions have established building performance standard (BPS) policies that require large buildings to meet increasingly stringent energy or emissions targets over time. BPS policies have been adopted by four states (Colorado, Maryland, Oregon, and Washington), the District of Columbia, and 12 localities. BPS policies are projected to significantly reduce energy use and emissions while delivering financial and health benefits to building owners and occupants. She conducts research on zero-energy and zero-carbon building policies and programs. Its independent analysis advances investments, programs, and behaviors that use energy more effectively and help build an equitable clean energy future.