When I saw these nice pictures on Flick'r of a group of young folks playing on the street, I was desperate to find out where it was.
Problem solved: Brandon, who actually took the photos, ordered new boules from us last week, I recognized his name and bingo!
It's just a public parking lot, next to the El train, empty on weeknights and weekends, only a block from where he lives. Although the rocks are kind of outsized, Brandon says it makes for a great shooting practice area, and you can't beat the true Chicago atmosphere nor the short walk.
W Berenice Ave on the map
PS: meanwhile Flick'r has added map location markers making it easier next time.