Squad Company 252 responded on the 10-75 to Box 1794, 991 Dumont Ave, off of Linwood Street for a fire in a store. First due units encountered heavy fire throughout the first floor store of a three story light commercial tenement. Upon arrival, members of 252 were order to the 2nd and 3rd floors to assist companies with primary searches. Fire auto exposed to the apartment on the 2nd floor and a 2nd Alarm was transmitted. All other searches proved negative.