One Liberty Place - first modern skyscraper taller than City Hall

One Liberty Place, completed in 1987 at 1650 Market St, was the first building constructed in Philadelphia to surpass the height of City Hall, marking a shift in the city's skyline and development policies. The tower's completion ended an informal practice of keeping new construction lower than the William Penn statue atop City Hall and prompted a wave of high-rise development in Center City. One Liberty Place remains a prominent feature of Philadelphia's modern skyline.