I'll get a couple more pics to clarify things. This is a large (very) electronics store. The electrical is pre-'70. (believe it or not, I remember it [Linked Image]) At one time it was part of a lighting fixture company that still occupies the building across the alley.
The installation is utility owned. Anaheim, CA has its own distribution system, and the low mounted switch handles are common all around town. Pri Voltage is 12KV (per sign on gate).