As always I am so thankful for all the viewers who submit information.... but in this case I do NOT think this is a match. ABOVE PHOTO: building on the left is the Municipal Light Water Power building as seen in the Rockford Files.... the building on the right is the address that was submitted by our viewer Don, Municipal Light Water Power building is: 2417 Daly St., Los Angeles CA 90031.
The buildings have two different facades. And as seen in the lower photo, the building in the Rockford Files was much wider with a widow to the left of the large entrance area.
Also the building as seen in the episode has the words MUNICPAL LIGHT WATER POWER straight across the canopy - the building on Daley Street has the words arched out around the canopy.
So my guess is that there were a few of these Municipal Light Water Power buildings in Los Angeles. We just haven't found the correct one yet.