Buildings in New York City have been found to have a median score of 67 out of 100 in Energy Star's Portfolio Manager -- above the national average of 50, according to a study prepared by the Natural Resources Defense Council for the office of Mayor Michael Bloomberg. The report looked at energy use of multifamily units and large commercial buildings. Five Penn Plaza was the top performer in NYC. "The point of this to say to a store or a building owner, 'you’re using five times more energy than your peers.' That’s literally money going out the door," says Melissa Wright, associate director of NRDC’s city energy project.