The fire began in one residential apartment building on 19th Street around 11:30 p.m. Thursday and quickly spread to two adjacent buildings.
Approximately 50 residents, some wearing nothing more than robes and pajamas, were evacuated to a school that the Red Cross set up as a temporary shelter.
Firefighters faced Arctic temperatures which quickly turned the water used to fight the flames into ice.
No one has been injured.
Officials have not determined what sparked the fire.