Large. 325 E. 10th St. Pittsburg is an odd town. I couldn't find a coherent historic district, but instead patches here and there, separated by railroad, industry, construction, and the like. The isolation of these old pockets may have preserved structures for now, but they also make it difficult for them to be restored to some commercially viable usage.
Some interior shots:
The city says the theater dates from the mid 1930s, and the Contra Costa Times indicates that they stopped showing movies there in the 1950s, after which time the building was used for other purposes. As far as I can tell, they haven't given up on efforts to restore and adapt it.