That actually makes me sad. I saw where someone found the actual original location, it is currently being gutted for renovation. In the interim, it was an italian restaurant, etc.
Seems odd that it would be easier to recreate it from scratch, plus cgi, rather than restoring the original.
Anyway, here's the original location.
http://storyboredom.blogspot.com/2007/06/flynns-arcade-from-tron-beforeafter.html
But wait!! There's no mention that it wasn't an arcade, just that it's the "historic Hull Building. To be quite honest, I've seen more than a few local "historic buildings" whore themselves out to whomever would pay rent, in order to keep the wrecking ball away. Seems possible there would be an arcade occupying it during the boom years. I would think a filmmaker (or the production designer) would opt to shoot at an existing arcade, with a few modifications, rather than populating an empty building with 100 games and decor.
I think I'll contact the Culver City public library, and ask them to look up the address in a "crisscross" directory, circa 1980-ish. See if someone beats me to it.
Does anyone have an idea, based on the games in the arcade, what is the least recent date the scenes could have been filmed? In other words, if Ms Pac Man is present, it's at least 1982 (right?) That would narrow down the directory searches.