Waltham, MA - A reported building fire came in for 97 Chestnut Street in Waltham at 9:01 A.M. on April 3rd. Engines 1 and 4, Squad 5, Rescue 1 and Ladder 2 were dispatched, along with Engine 2 as the RIT and Medic 1. Ladder 2 arrived on scene and reported heavy smoke showing and then heavy fire coming from the second floor. A second-alarm was transmitted at 9:13 A.M. Engine 3 and Tower 1 responded. Firefighters knocked down the heavy fire quickly, however there was a large amount of fire on the interior. The fire was under control in about 45 minutes. The Red Cross was requested for the displaced occupants. The State Fire Marshal was also requested.