"The Custom House Tower at 3 McKinley Square is a turn of the century skyscraper in the Financial District neighborhood of Boston, Massachusetts. The original Custom House was built 1837-1847 in a neoclassical style by architect Ammi Burnham Young. It was then at the water\'s edge. This building was in the form of a four-faced Greek temple with fluted Doric columns, of granite, weighing some 42 tons each. Its interior rotunda was capped with a skylight dome.The tower was built as an addition to this existing base 1913-1915 by the architecture firm of Peabody and Stearns. Although Boston had at that time a 125-foot height restriction, the Custom House was federally-owned and not subject to these restrictions. The new tower was 151m (496ft) tall, easily Boston\'s tallest building until the 1947 John Hancock Tower which is just one foot shorter. Both were trumped by the 1964 construction of the Prudential Tower. The clock on the upper tower of the building, measures 22 feet in diameter. The building has 32 floors and was recently converted into an 80 room Marriott Hotel. Fourteen years before this conversion, the tower laid inaccessible and unoccupied."