Fire personnel are continuing to investigate what caused a two-alarm blaze that destroyed a log cabin near the entrance to Mount Diablo State Park on Tuesday afternoon, a San Ramon Valley Fire Protection District fire marshal said.

The fire district received reports of what was originally believed to be a tree fire in the 2600 block of Mt. Diablo Scenic Drive in unincorporated Danville around 3 p.m., Fire Marshal Christina Jamison said.

Arriving crews quickly discovered a cabin-like rental home in flames on a property that contained two other homes, Jamison said.

Crews from the San Ramon Valley fire district and Cal Fire attacked the blaze, which gutted the rental home and burned 2 to 3 acres of brush, she said.

With 17 engines, three trucks, a helicopter and other equipment, firefighters were able to control the blaze in about an hour.

The home destroyed by the fire is not currently being rented, and no belongings were inside, but the damage is estimated to be about $750,000. Known as Mary's Haven, the building was used for the ribbon cutting and dedication of Mt. Diablo State Park on April 26, 1931.

No injuries were reported.

Jamison said the property owners had cleared the brush around the homes, which helped firefighters control the flames.

The fire marshal said the incident is a reminder to those who live near wildlands to create defensible space around their homes.

— Bay City News Service

Are you receiving Express, our free daily e-mail edition? See a sample and sign-up for Express.