@ossobuco,
Musso and Frank Grill - ate there a few times. They're famous as an old hangout, including for cocktails, but I was there before I'd tried my first Manhattan on my 21st birthday (not there, as it happens. Wonder if I can find a pic of Edna Earle's Fogcutters..)
(I see Musso's referred to in books about old LA)
Then there's the Nicodell - oy vey.
My father and mother planned this debacle (to me) for me. My mother made me a bright kelly green corduroy jumper (oh, god) and they arranged for us to eat there when the Notre Dame team did, there in LA for the USC game, of course. I suppose I was seventeen. I walked by the team on the way to the rest room. I'm sure I didn't even look in their direction. (oh, god, again).
Looking back I still cringe, but with later knowledge, I see it as the last memorable time we were a happy family.