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Show i fall"' i ! m AF &r-;- 'j; " ' P&. A 64-ACRE BUILDING ON A THREE-ACRE SITE is this model of the world's second largest high-rise office building, being studied by United States Steel's President, Leslie B. Worthington. To be the Corporation's Pittsburgh headquarters headquar-ters when completed in 1970, the 64-story, triangular-shaped structure will be the tallest skyscraper in the world outside New York and Chicago. Only New York's Pan-Am Building, among high-rise office structures, will contain a greater gross area than the new building, which provides almost an acre per floor. Mr. Worthington is holding a sample of USS Cor-Ten steel which will be used for the exposed columns and exterior walls of the building. The special steel which will be left bare and unpainted will weather to a deep russet, cinnamon-like color. Originally developed in the early 1930's for use in railroad freight cars, the steel is becoming a popular architectural material for exposed and unpainted applications. The building, 841 feet high, will be a pioneer showcase of new materials, new products, and new architectural and engineering engi-neering concepts. |