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The city of San Francisco will require owners of commercial buildings of at least 10,000 square feet to conduct an energy audit every five years and annually benchmark the energy performance under an ordinance adopted this week. In addition, under the measure, starting in October, owners of commercial properties that are larger than 50,000 square feet must file an annual report summarizing the energy performance of their buildings. Using the EPA online tool, Energy Star Portfolio Manager, owners are to benchmark their properties and annually disclose to the city information that includes the energy intensity of their buildings (kBTU per square foot per year) and carbon dioxide equivalent emissions due to energy use. . New York City, Seattle and Washington State are among the cities and states that also have auditing and benchmarking regulations.