Yep, I remember it well, having grown up in Villa Park (on the most southern side, so it was actually a long bike ride as a kid to B.J's!). It was on Ardmore and it was red brick back in the day. I started going there when there were no comic boxes and all the comics were stacked in grocery bags trimmed to about one foot high; plus, there were still some grocery items. Over the years I bought comics, paperbacks, postcards, etc. there. I attended many of the "Relax-a-cons" and probably at least half my comics were purchased at these cons!
I have some flyers and at least one newspaper article that I'll scan at some point and post here.
p.s. the owner's name was Hank Franklin.