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Home of the thriving financial district, relatively narrow LaSalle Street earned the moniker "The Canyon" (and it feels like one) because of the large buildings that flank either end. This one was designed by Holabird & Root and completed in 1930. The streamlined, 45-story giant recalls the days when art deco was all the rage. The artfully lighted marble lobby soars three stories, and Ceres (the Roman goddess of agriculture) stands atop its roof. Trading is no longer done here, but it's worth a look at what was the city's tallest skyscraper until 1955, when the Prudential Center topped it.