Firefighters responded at 3:04 a.m. to a fire in the 500 block of S. Main St. in Santa Ana, according to the OCFA.
A smoke alarm alerted someone inside the building of the fire.
The responding firefighters knocked down the fire in just five minutes, confined it to one business, and nobody was injured.
The cause of the fire is under investigation.
The SAPD provided assistance during the incident response.
The fire appears to have involved a business involving card and palm reading, next to the Cave Sports Bar.