chi-global meeting The 2017 Chicago Forum on Global Cities, organized by the Chicago Council on Global Affairs, was a three-day event that brought together civic, educational, business, and cultural leaders.

CHICAGO—Most observers of commercial real estate in the US forecast a steady if not spectacular rate of growth for some time to come. But anyone asked for their forecast usually includes a caveat. There is always, they say, the possibility of a “black swan” event, something from outside the world of real estate that nevertheless derails or damages the markets.