I wish I had known about the personalised 3-4 hour tour but I didn't do my research at least 10 days in advance. If you are prepared, book it - you can tailor it to any theme you like.
I did however do the instagreeter 1.5 hour of The Loop and it was fabulous. The guide was knowledgeable and thorough and had an 80% overlap with the Chicago Architecture Foundation's Historic Downtown tour which retails for $17. Do the CAF tour if you want detail. Honestly, the greeter's tour was more than sufficient for your average curious tourist. Can't recommend enough. I wish all cities had this service!
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