You may be referring to the Isaly's factory and store on the Blvd. of the Allies, which I think was in Oakland. We went there on a school trip in the late 1950's, and I went back many times as a young man.
Like you, I can almost remember each individual tile on the floor, and every scratch on the tables at the Isaly's on Washington Rd. in downtown Mt. Lebanon. Their vanilla fudge ice cream was the stuff dreams were made of. I used to go there every day after junior high school to flirt with the girls. Then I found Nick's poolroom in Dormont, and haven't been the same since.
This is for Clare, Billy, Terry Adeno, Cal, and me:
http://www.isalys.com/about-us/
Does that storefront picture bring back any memories?
Doc