Two Liberty Place

Liberty Place is a skyscraper complex in Philadelphia. The complex is composed of a 61-story, 945-foot skyscraper called One Liberty Place, a 58-story, 848-foot skyscraper called Two Liberty Place, a two-story shopping mall called the Shops at Liberty Place, and the 14-story Westin Philadelphia Hotel.

Prior to the construction of Liberty Place, there was a gentlemen's agreement not to build any structure in Center City higher than the statue of William Penn on top of Philadelphia City Hall. The tradition lasted until 1984 when developer Willard G. Rouse III of Rouse & Associates announced plans to build an office building complex that included two towers taller than City Hall.

Source: Wikipedia