Car dealers are required to disclose a car’s fuel efficiency rating to consumers. Now, in California, building owners will be required to disclose the building’s energy efficiency rating to buyers and lessees. As of Jan. 1, commercial buildings in California are required by law to participate in the U.S. Environmental Protection Agency’s Energy Star Portfolio Manager program. Energy Star has been around since 1992 and is seen on everything from kitchen appliances to HVAC equipment. Energy Star Portfolio Manager is a program that serves commercial building owners. In 2009, California utilities will be submitting building information to the Portfolio Manager,