All three apartments had been evacuated prior to the fire department's arrival.
The fire was burning in a utility room on the main floor of the structure.
Damage is estimated at $10,000, and the residents will be displaced for an unknown period of time while repairs are made.
The cause of the fire was under investigation.
Hours earlier, fire fighters extinguished a garage fire, while managing to protect an adjacent apartment building from major damage.
At 5:21 a.m., fire crews found an unattached garage engulfed in flames at 560 27th Street, said Bauman.
Of major concern was an adjacent apartment building, as well as a downed power line that was arcing on the garage, Bauman said.
The adjacent building sustained minor damage to the roof shingles from the heat, and a vehicle was damaged.
The loss that fire was estimated at $8,000. The cause remained under investigation.
No injuries were associated with either fire.