PORTLAND — A fire in a dentist’s office and computer repair facility Tuesday night caused damage estimated at $642,000, city officials said.

The fire at 812 Stevens Ave. was reported via a smoke alarm shortly before midnight. Firefighters called in a second alarm after responding to the fire, said Nicole Clegg, Portland’s spokeswoman.

About 30 firefighters were needed to fight the fire, which apparently originated on the first floor, where the dentist’s office was located.

Clegg said the damage to the building was estimated at $142,000 and the damage to the contents was estimated at $500,000.

No one was injured, she said, and the building’s smoke and fire alarms were all functioning.