Webdesigned by robert a. m. Webthe comcast center is philadelphia's tallest building and the 19th tallest in the us. In 2014, the construction of the comcast innovation and technology center. 1800 arch street, philadelphia, pa 19103 visit website. Webtoday, our encore looks at the top ten tallest proposals that are on the drawing boards for the city of brotherly love. Of these, six are located in center city,. Webseven of the ten tallest buildings in pennsylvania are in philadelphia; The remainder are in pittsburgh. Philadelphia is one of only five american cities with two or more completed.
