A member of a ComEd crew walks past a boarded up structure following a fire Thursday, Feb. 7, 2013, in the 3400 block of Lake Shore Drive in Joliet. | Matthew Grotto~Sun-Times Media
A ComEd crew works at the scene of a boarded up structure following a fire Thursday, Feb. 7, 2013, in the 3400 block of Lake Shore Drive in Joliet. | Matthew Grotto~Sun-Times Media
A member of a ComEd crew walks past a boarded up structure following a fire Thursday, Feb. 7, 2013, in the 3400 block of Lake Shore Drive in Joliet. | Matthew Grotto~Sun-Times Media
A board-up crew walks at the scene of a structure following a fire Thursday, Feb. 7, 2013, in the 3400 block of Lake Shore Drive in Joliet. | Matthew Grotto~Sun-Times Media
A view of damage following a fire Thursday, Feb. 7, 2013, in the 3400 block of Lake Shore Drive in Joliet. | Matthew Grotto~Sun-Times Media
JOLIET — Fire caused major damage to an unoccupied duplex unit early Thursday. Battalion Chief Jeff Carey said it was 4:10 a.m. when crews arrived to find flames coming through the roof of 3424 Lake Shore Drive. Firefighters spent two hours battling the blaze, which …