SKY7 is live over the scene, where flames can be seen engulfing a building. CAL FIRE said forward progress of the fire has been stopped.
Officials said the incident appears to have started as a brush fire before spreading toward several structures.
Crews remain on scene monitoring hot spots.
The fire is burning in Livermore's Wine Country -- where a lot of wineries and taprooms are located.
No injuries have been reported.
The scene remains active, and investigators have not been able to access the area.
Stay with ABC7 News for the latest details on this developing story.