I started going to Cubs games in the late 70's, but I was still pretty young then. From my recollections (probably moreso the early 80's) it was always a McDonald's. We'd get food there and then take it into Wrigley to eat while we watched BP. That corner was the home Franksville in the 60's through the early 70's. Not sure when it changed hands, or if there was another tenant between Franksville and McDonalds.