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Saturday, April 29
Chicagoist took a tip from its parent and tracked down the "Google Center" of the city — the point you see if you type "Chicago IL" into GoogleMaps and zoom all the way in. Some other city centers after the jump.
• geographic center of the Loop: the Chase Tower
• "Number One City Datum Mark," the point from which the heights of all city buildings are measured: Northern Trust headquarters, 50 S. LaSalle
• And the "zero point," the center of the city's grid, is at State & Madison, of course.