The sleek glass curtain wall of Philadelphia's tallest building, the Comcast Center, contrasts with the 1965 built 4 Penn Center office tower.

- Image ID: WWGPAN
The sleek glass curtain wall of Philadelphia's tallest building, the Comcast Center, contrasts with the 1965 built 4 Penn Center office tower.
Craig Jack Photographic / Alamy Stock Photo
Image ID: WWGPAN
The sleek glass curtain wall of Philadelphia's tallest building, the Comcast Center, contrasts with the 1965 built 4 Penn Center office tower at 1600 John F Kennedy Boulevard
Location: Philadelphia, PA
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