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PPG Place is a complex in downtown Pittsburgh, Pennsylvania consisting of six buildings within three city blocks and five and a half acres. Named for its main tenant, PPG Industries who initiated the project for its headquarters, the buildings are all of matching glass design consisting of 19,750 pieces of glass. The complex centers around One PPG Place, a 40-story office building. Groundbreaking ceremonies occurred on January 28, 1981.
World Trade Square is a proposed office complex to be built on a 5.5-acre (22,000 m) site in the Delaware Riverfront region of Philadelphia, Pennsylvania. The complex would consist of four high-rise buildings: Old City Harbor Tower I, Old City Harbor Tower II, Old City Harbor Tower III, and the Greater Philadelphia World Trade Center.