0338 hours – Box Alarm – Grand River and Calumet, fire reported in a commercial building, Central has no address. Engines 1,17,27,39, Ladders 7,20, Squads 2,4, Chiefs 1,5. Squad 4 on scene with a 20x40 commercial building going and advised first engine will be stretcning. Engine 39 stretched. Chief 1 assumed incident command reporting fire in a 2 story, commercial building approximately 100x100 and companies would be taking a defensive postiure. Engine 27 (RIT) and Chief 5 (Safety). Tower operations from Ladders 7 and 20. Collapse of interior floors. Fire out at 0515 hours.