Units responded to a three-alarm fire reported in a two-story mixed-use commercial building at 1100 Moraga Way at about 6:50 p.m., Orinda-Moraga Fire District Fire Marshal Mike Mentink said.
Arriving firefighters reported the second floor and a portion of the roof to be engulfed in flames, Mentink said.
The fire, which prompted the response of 60 firefighters, was difficult to battle, Mentink said, as accessing flames on the second floor was possible only with ground ladders and by digging through a tile roof.
A sustained attack was managed by arriving water trucks, and the fire was controlled at about 8:40 p.m., Mentink said.
No one was injured fighting the fire.
A preliminary estimate of structural damage was set at $1 million, and lost property inside the building was worth approximately $300,000, Mentink said. Firefighters were able to remove much of the office equipment on the building's first floor.
An investigation into the cause of the fire will be conducted at first light this morning.