A new study, “Local Leaders in Sustainability,” from the American Institute of Architects reveals that 14% of U.S. cities with a population of at least 50,000 have begun mandating green standards for new commercial buildings. According to Brooks Rainwater, director of local relations for AIA, over the past five years, the number of cities with green building programs has increased more than 400%. In addition, 36 more cities, as of last summer, were in the process of developing green building programs. Rainwater also notes that green building laws “incentivize” green development in the private sector.