Firefighters extinguished a fire at Union Bank in Atascadero on Thursday.
It broke out at around 1 p.m. at the bank located in the 7100 block of El Camino Real, near Highway 41.
Fire officials say crews arrived to find heavy smoke coming from the roof near the back corner of the building. The inside of the bank was clear of smoke and fire.
Three employees were evacuated from the building. Fire officials say they were not aware of the fire.
Once crews made access to the roof, firefighters reportedly found a portion of the heating and ventilation system was burning.
No injuries were reported.
The cause of the fire is under investigation.