(CBS SF) – A shipping-and-receiving building was damaged in an early morning fire at Skywalker Ranch today, a Marin County fire battalion chief said.

The fire was reported just after 4 a.m. at the 4,000-acre ranch off of Lucas Valley Road south of Novato. The ranch, owned by filmmaker George Lucas, houses the headquarters of Lucasfilm and Skywalker Sound.

The sprinkler system went off, which helped firefighters extinguish the flames quickly, Battalion Chief Mike Giannini said.

A fire brigade based at the ranch initially responded to the blaze before Marin County firefighters arrived, he said.

The building contains office furniture and supplies, and its roof was damaged, he said. The total damage is estimated at about $25,000 Giannini said.

The cause of the fire is under investigation.

No injuries were reported.

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