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1984 – One PPG Place, Pittsburgh, Pennsylvania

Architect: Johnson/Burgee Architects


The entire PPG Place complex has 231 glass spires. The building features a glass “winter garden” on the west side, and a monumental plaza to the east surrounded by shorter buildings with the same walls and spires as One PPG. The tower contains 19,750 pieces of glass.

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1970 – U.S. Steel Tower, Pittsburgh, Pennsylvania

Architect: Harrison & Abramovitz In the initial planning stages, the U.S. Steel Corporation seriously considered making this development the world's...