Chicago firefighters battled fire in a commercial building at 4749 W. Lake Street just after midnight Monday (2/12/18). The fire was discovered by Truck 29 while returning to quarters from a Still & Box Alarm fire. Flames had already engulfed the entire building and the alarm was eventually elevated to a 2-11. The building collapsed shortly after companies went to work. Two multi-versals along with elevated master streams from Tower Ladder 5, Tower Ladder 14, Squad 2A and Truck 29 were deployed. One member from the 5-11 Club Support Service Unit was injured after loosing his balance on a patch of ice and was transported to a hospital.