A handsome and eclectic stretch of buildings along Michigan Avenue known as “Chicago’s Front Door” offers a view that reflects the city’s status as a destination for serious architecture. Louis Sullivan and Dankmar Adler’s Auditorium Building, where a young Frank Lloyd Wright designed interiors, is right there on Grant Park; so is Daniel Burnham’s Railway Exchange, where he drew up the 1909 Plan of Chicago.

Now a glass-and-aluminum apartment tower anchors the southern end of this scene, filling in a rare gap within this landmarked streetwall and putting a bow on the career of another heroic figure in Chicago’s architectural history: Helmut Jahn.