Firefighters battled fast-moving flames from the porch of the Crown Street home just before 6:30 a.m.
Heavy flames were roaring out the top floor window of the private home, which could be a two-family apartment building.
Firefighters entered the building through the ground floor and via ladder to the balcony.
They fought their way through the flames to get inside, and the fire was brought under control fairly quickly.
There were no reports of any injuries to residents, and no firefighters were hurt.
The cause of the fire is under investigation.