The lot is fairly small for such a large building. From this image from Live Search, it looks like that's the only way they could fit the building onto the site.
The layout isn't too odd. Like most stores, the entrance leads in front of the registers and then into parallel shelves perpendicular to that main street (Halsted). It looks like it was built for the configuration that it holds now, and probably has always held. Also, from Google Maps, the building is about 100' deep from the road x 200' long, so 20,000 sf. By reference, the new Jewel on Roosevelt that it competes with is 55,000.
Here's the Live Search images of the one at Central & Lawrence in Jefferson Park. It's obviously of the same style, though it looks a little different, and is accessed via a walk across the parking lot. I'm interested in the interior, though, so I'll have to take a trip up there and see what it's like. It's listed as built in 1967 also, so the two are obviously brothers (or are supermarkets sisters?)
