Chad, I'm surprised to read that. If I had known about it before I would have tried to make the stay more comfortable for you. What's funny is that the apartment is in a 9th floor that's far away from the street side. You are the first person to have concerns over traffic noise, it's such a shame and I'm really surprised about it.
A couple of weeks ago I hosted a couple with a newborn, and they slept perfectly according to their review, even the baby! So it's so strange... Other people also complemented the apartment since it was "very quiet" ...
Anyway, just to be clear: There isn't any wall that is in contact with the elevator, because there's two of them, then the staircase, and finally my apartment. it's 10 meters away probably (more or less 30 feet for you).
Thanks for your review, and also thanks for the fridge magnet of Chicago! Very kind of you ;)