The US Steel building is the tallest skyscraper in Pittsburgh and contains over 44,000 U.S. tons of structural steel, and almost an acre of office space per floor.This aerial view taken during construction reveals its triangular floor plan with indented corners as well as its exterior structural columns

The US Steel building is the tallest skyscraper in Pittsburgh and contains over 44,000 U.S. tons of structural steel, and almost an acre of office space per floor.This aerial view taken during construction reveals its triangular floor plan with indented corners as well as its exterior structural columns