MABAS21 - Crews were dispatched to a reported structure fire in the 1600 block of Broadway at approximately 1pm on 12-28-11. Crews reported a large header from quite a distance and a working fire was declared in a 25x60 2 story brick apartments over a store front. An aggressive attack was made and conditions deteriorated quickly. An exterior attack was executed from multiple angles. Crews from Lake Station, Lake Ridge, and Merrillville were requested to assist. The building did collapse towards the end of the fire. It has not been determined what happened as of yet to Truck 4 (Truck 7) when it caught fire. One firefighter was treated for exhaustion. Crews worked on the fire scene for over two hours.