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Philadelphia, the largest city in the U.S. state of Pennsylvania, is home to 381 completed high-rises,〔(【引用サイトリンク】title=About: Philadelphia )〕 29 of which stand taller than . The tallest building in the city is currently the 57-story Comcast Center, which rises in Center City.〔(【引用サイトリンク】title=Comcast Center )〕 Comcast Center is also the tallest building in Pennsylvania and the 19th-tallest building in the United States. The second-tallest building is One Liberty Place, which rises 61 floors and .〔(【引用サイトリンク】title=One Liberty Place )〕 One Liberty Place stood as the tallest building in Pennsylvania for over 20 years until the completion of Comcast Center in 2008. Overall, six of the ten tallest buildings in Pennsylvania are in Philadelphia, with the remainder being in Pittsburgh.〔(【引用サイトリンク】title=Diagram of Tallest Buildings in Pennsylvania )〕 Philadelphia is one of only four American cities with two or more completed buildings over tall.〔(【引用サイトリンク】title=Diagram of Tallest Buildings in the United States )〕 Philadelphia's history of tall buildings is generally thought to have begun with the 1754 addition of the steeple to Christ Church, which was one of America's first high-rise structures.〔(【引用サイトリンク】title=Christ Church )〕 Through most of the 20th century, a "gentlemen's agreement" prevented buildings from rising higher than the 548-ft (167-m) Philadelphia City Hall.〔(【引用サイトリンク】title=City Hall )〕 Despite this, Philadelphia amassed a large collection of high-rise buildings. The completion of One Liberty Place in 1987 broke the agreement,〔 and Philadelphia has since seen the construction of eight skyscrapers that eclipse City Hall in height. Philadelphia has twice held the tallest habitable building in North America, first with Christ Church, then with City Hall. The latter reigned as the world's tallest building from 1894 to 1908,〔(【引用サイトリンク】title=City Hall )〕 and is currently the world's second-tallest masonry building, only shorter than Mole Antonelliana in Turin. Like other large American cities, Philadelphia went through a massive building boom in the 1970s and 1980s, resulting in the completion of over 20 high-rise buildings. , there are several major high-rise construction projects underway in Philadelphia. The largest of these projects is the Comcast Innovation and Technology Center, which began construction in 2014 and will rise upon completion. The Comcast Innovation and Technology Center will surpass Comcast Center by over to become the tallest skyscraper in Pennsylvania and the tallest building in the country outside of New York and Chicago.〔(【引用サイトリンク】title=Comcast Innovation & Technology Center )〕 ==Tallest buildings== This list ranks completed and topped out skyscrapers in Philadelphia that stand at least tall, based on standard height measurement. This includes spires and architectural details but does not include antenna masts. An equal sign (=) following a rank indicates the same height between two or more buildings. The "Year" column indicates the year in which a building was completed. The only demolished building that would have ranked on this list was the One Meridian Plaza, razed in 1999.〔(【引用サイトリンク】title=One Meridian Plaza )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of tallest buildings in Philadelphia」の詳細全文を読む スポンサード リンク
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