how long did it take to build philadelphia city hall
Philadelphia City Hall Philadelphia City Hall is the seat of government for the city of Philadelphia, Pennsylvania. The building was constructed from 1871 to 1901 within Penn Square, in the middle of Center City. John McArthur Jr. designed the building in the Second Empire style. City Hall is a masonry building whose weight is borne by granite and brick walls up to 22 ft (6.7 m) thick. The principal exterior materials are limestone, granite, and marble. The final construction cost was $24 million.