In the mid-80s, Chicago released roughly 8,000 ballads, usually for movie soundtracks, each one identical to the last. One of my most hated sounds in music is the Chicago Ballad Drum Sound: one beat per measure, on a 300-feet wide snare drum sitting at the bottom of an abandoned well.
Any of these would be thoroughly inappropriate as walk up music. However, I’m going to take the suggestion of @TurnpikeTony on Twitter and opt for “Along Comes a Woman.” Because it is a rare example of Chicago of this era trying to “rock,” which is worse. And also because it might be accompanied by this video.