They were successful in stopping the fire before it reached the attic of the building in the 4600 block of Penn Avenue.
The damage could be substantial, Hart said, but he could not yet put a dollar amount on it.
Crews from Fairborn, Beavercreek, Dayton and Kettering assisted Riverside in handling the fire run, Hart said.
There were no injuries, he said.
A Riverside apartment building has been evacuated after smoke from an air conditioner filled up a unit, according to firefighters.
Crews were dispatched to the complex in the 4600 block of Penn Avenue around 3:10 p.m. after an air conditioner unit caught fire.
Officials said they are working to determine if the fire has spread to other parts of the building.
No injuries have initially been reported.
We have a crew on the scene and we’ll update this page as we learn more.