What does Boston’s Hancock Tower have in common with the U.S. Customs Building in New York and the Wachovia Financial Center in Florida? Well it so happens that they, along with some 930 other structures, recently won recognition by the EPA’s Energy Star program for doing an exemplary job of cutting their energy use in 2006. The Energy Star program, which has been around about a decade, encourages offices to do a better job of turning off unnecessary lights and other such actions to save on energy. A building earning an Energy Star uses about 35 percent less electricity than an average building, and growing numbers of offices are discovering this is a program worthy of getting plugged, or maybe should we say unplugged, into to!