The front building is the store facing Sunset Blvd. The studio is still there behind it. It seemed to be operational I believe there are still offices in it run by Jay Ward's daughter. It was closed the day I was there but there was a note in the window when she was there for office hours.
If I can get some pictures scanned I'll send you a picture of me in front of the Sherman sign outside the studio and a picture of grown up Sherman. Please keep in touch so I don't forget.
P. S. What do you think of Sponge Bob Squarepants?
I've only just started watching the Simpsons within the last year or so. On average I would say that I only catch re-runs of the show, once or twice a week. I'm not sure which character Sponge Bob Squarepants is.