[['name', 'street address', 'years as tallest', 'height ft (m)', 'floors', 'architect'], ['independence hall', '520 chestnut street', '1748 - 1754', '134 (41)', '-', 'edmund woolley and andrew hamilton'], ['christ church', '20 north american street', '1754 - 1856', '196 (60)', '-', 'robert smith'], ['tenth presbyterian church', '17th & spruce streets', '1856 - 1900', '250 (76)', '-', 'john mcarthur , jr'], ['north american building', '121 south broad street', '1900 - 1901', '267 (81)', '21', 'james h windrim'], ['philadelphia city hall', 'broad & market streets', '1901 - 1987', '548 (167)', '9', 'john mcarthur , jr'], ['one liberty place', '1650 market street', '1987 - 2008', '945 (288)', '61', 'helmut jahn'], ['comcast center', '1701 john f kennedy boulevard', '2008 - present', '975 (297)', '57', 'robert a m stern architects']]
the current Tallest Building is 30 foot taller than the prior Tallest Building
the current [ENT] [ENT] is 30 foot taller than the prior [ENT] [ENT]