City Hall - Philadelphia, PA - American Guide Series on Waymarking.com

CITY HALL, Broad and MarketSts., tallest building in Philadelphia and one of the largest municipal buildings in the world, occupies four-and-a-half-acre Penn Square, known as Center square until the Center House' of the city's first waterworks on the site was removed in 1829.

The massive seven-story structure, designed by John J. McArthur, Jr. in the late French Renaissance style, encloses a landscaped courtyard at the intersection of the city's main north-south and east-west thoroughfares. It has four similar facades of white granite and marble, embellished with columns, pedimented windows and a variety of sculpture. Atop the tower (open 9-3:30 Mon.-Fri.; 9-12 Sat.), rising more than 500 feet above the street, is a 26-ton statue of William Penn modeled by Alexander Milne Calder and hoisted into place in 1894, 24 years after the construction of the building had started. A gigantic four-faced tower clock, its illuminated dials, visible for miles, was installed in 1899.

--- Pennsylvania: A Guide to the Keystone State, 1940; page 268

There are only five buildings in Philadelphia that are higher than Billy Penn's hat. The statue of William Penn (which is 37 feet (11 m) tall) which sits high atop the clock tower is probably the most well-known and recognized statue in Philadelphia. At one time law decree that no building be built higher than the Statue's Hat. There was a big stink when this law was challenged. Ultimately progress won and Billy looks up not to others.

Beneath William are other statues as well, attached to a cornice or some other thing holding them up. There are also statues scattered about the various courtyards at the bottom of the building. The clock can also be seen forever it seems, at least in Center City Philadelphia. There is also a tribute to Alexander Milne Calder, who constructed the William Penn statue.

From my pals at Wikipedia: The building was designed by Scottish-born architect John McArthur, Jr., in the Second Empire style, and was constructed from 1871 until 1901 at a cost of $24 million. Originally designed to be the world's tallest building, by the time it was completed it had already been surpassed by the Washington Monument and the Eiffel Tower, though it was indeed the world's tallest habitable building at the time of opening. It also was the first modern building (excluding the Eiffel Tower, see above) to hold the record for world's tallest and also was the first secular habitable building to hold this honor: all previous holders of the position of world's tallest were religious structures, whether European cathedrals or, for the previous 3,800 years, the Great Pyramid of Giza.