A 24-year-old man faces drug-related charges after police discovered about 40 marijuana plants in his LaSalle apartment.
Police were called to the fourplex on John F. Kennedy Street early Monday morning after a fire broke out.
The fire started in the kitchen on the first floor and quickly spread to the second floor and the roof.
When police arrived, they discovered a marijuana grow-op in the man's apartment.
"They discovered a plantation," said Montreal police spokesman Raphael Bergeron.
The fire caused one person to be transferred to hospital to be treated for burns.
In all, five people were forced from the building.
Bergeron said firefighters are still trying to determine the cause of the fire. The investigation has been handed over to police.