I ended up in a garage on lower Wacker. No idea what the name was. I was trying to get to another one I saw, but no matter how I went, I could not figure out how to get there.
The garage had an elevator that ran up to upper Wacker. That worked out quite fine for me. $30 a day wasn't terrible - certainly less than the $52 a day Valet parked. I do wish they had some kind of stairway o entranceway on lower Wacker, though. Seems like it would make a lot more sense.
Definitely glad I had the car. Gave me a chance to get outside the inner city for abit, could actually get to a few more places than I otherwise would have been able to. With a little planning, and I think I saved a lot of time that I would have spent on a train.