The most recent mass shooting happened in the 800 block of North Ridgeway Avenue in Humboldt Park around 1:40 a.m.
About 15 minutes in, the bulk of the fire was knocked down and crews began overhaul.
Firefighters found a man in the dwelling; he was checked out and released at the scene.
The flames at the two-story structure were extinguished in about 10 minutes.
The fire was above a commercial laundry equipment store in the Borough Park neighborhood of Brooklyn.
An online video shows rapid fire spread during a DJ's pyrotechnics show and people's attempts to escape the raging flames.
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