Firefighters responded to the blaze at the four-story, 36-unit building on Charles Street shortly after 6 a.m. Thursday. One resident was rescued from the third floor and taken to a hospital with smoke inhalation. A firefighter also was treated for minor injuries.
Fire officials say everyone in the building got out safely.
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Authorities say a car fire spread to other vehicles in a basement garage, then spread to the building. The cause is under investigation.
Part of the structure collapsed, and an emergency demolition was expected.
A temporary shelter for the displaced residents was set up at a nearby school.