A total of 140 firefighters responded to a five-alarm fire in downtown Montreal on Saturday.
The blaze gutted the residential building and left 20 people homeless.
Firefighters worked from 10 a.m. until 1:45 p.m. to extinguish the fire.
READ MORE: Montreal firefighters undertake smoke detector blitz
Montreal Fire Department chief of operations Benoit Martelle told Global News that the fire was believed to be accidental.
Martelle said the fire started, possibly with a thermostat, on the fourth and last floor of the building.
The 100-year-old building was renovated and had two ceilings which, paired up with the low temperatures, made it more difficult for firefighters to control.
Damages are estimated at $100,000.