At 03:09 hrs FDNY Bronx phone alarm box 3563 was filled out confirming a working fire in a taxpayer at 3105 Bainbridge Ave. Companies responded and arrived to find heavy fire throughout a 1 story 180'X 100' taxpayer. An aggressive attack was attempted but was unsuccessful due to the large body of fire and a partial collapse of the rear. Multiple lines stretched and operating, 4 tower ladders operating for heavy fire throughout a 1 story 180'X100' taxpayer. All searches came back negative and the fire was finally placed under control about 5 hrs after the initial alarm. The fire was deemed suspicious due to the large body of fire on arrival and was turned over to the fire marshals.