The fire was reported at Party Time, a retail space located near the intersection of West San Carlos Street & Meridian Avenue, at about 4:15 a.m., according to San Jose fire Capt. Mike Van Elgort.
Firefighters arrived at the closed store to find an exterior fire that was spreading into the attic space of the building, Van Elgort said.
The blaze was knocked down at about 4:45 a.m., according to Van Elgort.
An electrical box was still smoking after the fire was knocked down and firefighters remain on scene this morning waiting for PG&E to turn off all electricity to the building, according to Van Elgort.
The cause of the fire remains under investigation, Van Elgort said.
