Philadelphia City Hall is the seat of government for the city of Philadelphia, Pennsylvania. At 167 m (548 ft), including statue, it is the world's tallest masonry building: the weight of the building is borne by granite and brick walls up to 22 feet thick, rather than steel; the principal exterior materials are limestone, granite, and marble.
It was the tallest habitable building (although surpassed by monuments) in the world from 1901 to 1908 and the tallest in Pennsylvania until 1932 when surpassed by the Gulf Tower. It remained the tallest building in Philadelphia until the construction of One Liberty Place (1984-1987) broke the informal "gentlemen's agreement" that limited the height of tall buildings in the city.
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