Well, Curtis didn’t get very far from Dead Cal’s repair shop before he got coldcocked by Jack. The streetsign in the episode clearly shows Mayall Street again, and by forsenically investigating the block numbers blurrily posted on that Mayall sign, we were able to determine the coldcocking was filmed here. If you have Google Earth, you can zoom in far enough to determine that the area where Jack threw Curtis, for later easy pick-up by CTU, was between a concrete fence and a chain-link fence at this intersection, probably next to what appears to be a baseball diamond.