chi-600-West-Chicago-river-with-boat-2 (2) 600 West Chicago was once a catalog warehouse for Montgomery Ward.

CHICAGO—Sterling Bay has made itself into one of the city’s most important developers. It will soon open the new global headquarters for McDonald’s in the West Loop, one of several company projects transforming the office landscape and helping create new submarkets. And its latest move, the $510 million acquisition of the mammoth riverfront headquarters of Groupon at 600 W. Chicago Ave., will also bring changes to the city.