VIDEO: A building that was once a Denny’s restaurant in Auburn went up in flames overnight. The scene was along Auburn Ravine Road. Firefighters responded around 1 a.m. Wednesday and found a raging fire consuming the building. About 30 to 40 firefighters were called to the scene. While the restaurant had been closed for more than a year, firefighters had to work quickly to prevent flames from spreading to other nearby structures. Firefighters believe the fire started in the attic. The building is believed to be a complete loss, firefighters say. Exactly what started the fire is under investigation.