On February 23, 2021, the City of Boston hosted an open house to review its forthcoming emissions performance standard that will set limits on emissions from energy use in existing large- and medium-sized buildings. This policy is a key strategy for meeting the city’s 2050 goal of carbon neutrality. Existing buildings are responsible for three-quarters of citywide emissions in Boston. Three other U.S. cities have adopted building performance standards—Washington DC, New York City, and St.