... 10 miles on a bike is mamby pamby, no problem.  Leave a change of clothes at work, use showers either at work or get a health club membership near where you work.  I used to do it all the time ... Chicago is much more spread out than Denver, I used to ride from near Shaumburg downtown to the Wrigley Building and back.  Lake Michigan winds can be fierce, but I was tougher!  ;)