Platoon Capt. Robert Skeldon with the Kelowna Fire Department says crews were called about 8:45 p.m. to the building at 1740 Richter St.
Crews arrived to find heavy smoke coming from a single unit on the third floor, with water in the hallway.
Firefighters found signs of an obvious fire inside the unit, with two sprinkler activations.
There was no fire extension to the rest of the building, however there was water damage to multiple units, says Skeldon.
A search was conducted to ensure all occupants were safely out of the building.
There were no injuries in the incident.
The cause of the fire is under investigation, but is not considered suspicious.
KFD responded with four engines, a rescue unit, ladder truck, command unit, and 20 personnel.
RCMP, paramedics and emergency support services assisted at the scene.