This guide provides local governments and urban leaders around the world with the background, guidance and tools needed to accelerate building efficiency action. The authors detail eight actions that deliver accelerated building efficiency in cities, including (1) building efficiency codes and standards, (2) efficiency improvement targets, (3) performance information and certifications, (4) incentives and finance, (5) government leadership by example, (6) engaging building owners, managers, and occupants, (7) engaging technical and financial service providers and (8) working with utilities.