Investigators are trying to figure out what started a fire that nearly destroyed much of Main Street in Madison. It broke out at the antique store on Main Street just after 10:30 p.m. Tuesday.Officials with the Fire Marshal’s office say the fire started in the basement.Madison Fire Chief Roger Lightbody tells us he arrived to see heavy black smoke coming out of the building.”First trucks got there. I tried to get a crew to enter the building. They got in about 5-6 feet I could see the smoke changing and I ordered an evacuation. Pulled them out. Just as they were getting out the whole place just totally erupted in fire.”The fire destroyed three buildings, which were unoccupied and under renovation.The chief says if the fire had gotten inside the brick building next door the entire south side of Main Street would be gone.Two firefighters were treated for minor injuries at the scene.We’re told the same antique store also caught fire two years ago. Smoking materials were the cause of that fire.