Battalion-10 had a 2 and 3 story 100 x 150 brick wharehouse. He had heavy fire on all four sides in the 2nd & 3rd floors. Eventually the 2nd & 3rd floors became fully involved with fire through the roof. All companies in svc with numerous master streams on all 4 sides of the bldg. A major collapse of the "A" side of the bldg 2nd & 3rd floor, into the bldg.