I remember Kon Tiki Port - and yes, it was in what is now the Intercontinental - you had to enter on the side of the building. And Trader Vic's was in the basement of the Palmer House, right? (Although it may have had a separate Wabash entrance - I don't know about that.)
The other major restaurant in that category was Don the Beachcomber, which was another basement space on Walton (and was where my parents had their first date). That building was torn down and replaced by the mall that now houses Bloomiingdale's at 900 N. Michigan.
Loudon Wainwright III wrote: The good old days, they're good and gone now. That's why they're good ... because they're gone ...