According to officials, around 10:50 a.m., firefighters responded to a report of smoke at 336 Boston Post Road.
At the scene, fire crews discovered a smoldering fire inside the roof of the structure.
The flames were quickly extinguished and employees were allowed to return to work after the building was deemed safe.
A section of Boston Post Road was closed to traffic for a period of time but it has since reopened.
The cause of the fire is under investigation.