chi-postoffice_5 The Old Post Office in Chicago has sat vacant since the mid-1990s, but the city has accepted a developer’s plan to transform it into new office complex that may fit Amazon’s needs.

CHICAGO—When Amazon requested that cities put together proposals for a future second headquarters, dubbed HQ2, that will complement its Seattle hub, one of the first criteria mentioned was that the metropolitan area must contain at least one million people. By that measure, however, more than 50 US cities are eligible. Many observers feel a much smaller group of metros have the true inside track, and Chicago is one of the likely frontrunners. But Amazon probably had a good reason for putting out the call to so many locales.