PHOTOS: The Philadelphia skyline through the years
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The Philadelphia skyline continues to expand, both upward and outward. The skyline is shown here from the 'Dalian on the Park' building above Whole Foods Market near the Benjamin Franklin Parkway.
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The under-construction Comcast Technology Center, right, will surpass its corporate sibling, the neighboring Comcast Center, as the tallest building in Philadelphia.
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The three Cira Centre buildings in University City, built between 2004 and 2017, mark the skyline's westward expansion.
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The RiverLink Ferry runs between Camden and the Philadelphia waterfront in this file photo from July 2016.
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The Comcast Technology Center, expected to open in 2018, takes shape behind the top of the BNY Mellon Center in this photo from December 2016.
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One Liberty Place, as seen from Two Liberty Place, broke Philadelphia's so-called height barrier by rising above the William Penn statue atop City Hall.
Philadelphia Department of Records/PhillyHistory.org
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City Hall, show here from the Benjamin Franklin Parkway in 1917, was among the tallest buildings in the world when construction finished in 1901.
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Various office buildings had approached – but not surpassed – William Penn's statue atop City Hall when this photo was taken in 1978.
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The Philadelphia skyline, as viewed from Belmont Plateau, was capped by the William Penn statue atop City Hall in 1983. But that was about to change.
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One Liberty Place, viewed from Veterans Stadium in December 1987, was the first building to rise higher than the William Penn statue atop City Hall. Within five years of its completion, Philadelphia boasted seven skyscrapers taller than City Hall.
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Philadelphia's skyline in October 1990, as viewed from the South Street bridge.
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The Callowhill neighborhood literally sits on top of Center City, with its southern border butting up to Chinatown and the Vine Street Expressway.
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The setting sun reflects off the Cira Centre South tower on Walnut Street.
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Looking east at the Philadelphia skyline from University City.
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The Philadelphia skyline as seen from Martin Luther King Jr. Drive near Eakins Oval in 2017.