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million+ today)〔https://news.google.com/newspapers?id=LdtaAAAAIBAJ&sjid=o20DAAAAIBAJ&dq=us-steel-building&pg=4167%2C125578〕 | floor_area = | architect = Harrison, Abramovitz & Abbe | structural_engineer= Leslie E. Robertson Associates | main_contractor = Turner Construction | developer = | owner = The 601W Companies〔http://www.601wcompanies.com/portfolio〕 | management = Winthrop Management | references = }} U.S. Steel Tower, also known as the Steel Building (formerly USX Tower) is a 64-story, skyscraper with of leasable space at 600 Grant Street in downtown Pittsburgh, Pennsylvania. It is the tallest skyscraper in Pittsburgh, the fourth tallest building in Pennsylvania, the 41st tallest in the United States, and the two hundred and twentieth tallest building in the world. It held its opening dedication on September 30, 1971.〔https://news.google.com/newspapers?id=KSsNAAAAIBAJ&sjid=vWwDAAAAIBAJ&pg=7215%2C119964〕〔https://news.google.com/newspapers?id=ba8iAAAAIBAJ&sjid=ALMFAAAAIBAJ&pg=3201%2C406510〕 The tower's original name when completed was the U.S. Steel Building and was changed to USX Tower in 1988. The name was finally changed back to the U.S. Steel Tower in January 2002 to reflect U.S. Steel's new corporate identity (USX was the 1990s combined oil/energy/steel conglomerate). Although no longer the owner of the building, U.S. Steel is one of the largest tenants. The building is located at 600 Grant Street, ZIP code 15219. ==History== In the planning stages, U.S. Steel executives considered making the building the world's tallest, but settled on and the distinction of being the tallest building outside New York City and Chicago. However, it eventually lost even that distinction to newer buildings erected across the United States. Prior to 1970, the tallest building in Pittsburgh, at 44 stories, was the Gulf Building, now known as Gulf Tower. In 2014, the elevators were modernized by "Schindler PORT" The U.S. Steel Tower is architecturally noted for its triangular shape with indented corners. The building also made history by being the first to use liquid-filled fireproofed columns. U.S. Steel deliberately placed the massive steel columns on the exterior of the building to showcase a new product called Cor-ten steel. Cor-ten resists the corrosive effects of rain, snow, ice, fog, and other meteorological conditions by forming a coating of dark brown oxidation over the metal, which inhibits deeper penetration and doesn't need painting and costly rust-prevention maintenance over the years. The initial weathering of the material resulted in a discoloration of the surrounding city sidewalks, as well as other nearby buildings. A cleanup effort was orchestrated by the corporation once weathering was complete to undo this damage, but the sidewalks still have a decidedly rusty tinge. The Cor-Ten steel for the building was made at the former U.S. Steel Homestead Works. Rockwell International, which had its headquarters in the building, displayed a large model of the Rockwell-designed NASA Space Shuttle in the building's lobby until the company moved its headquarters to Southern California in 1988. In May 1986 two men parachuted off the roof of the tower before being arrested by Pittsburgh Police near the Civic Arena.〔http://www.apnewsarchive.com/1986/Two-Parachute-Off-U-S-Steel-Building/id-ac05b02d67ce446ead7491a295053346〕 The tower contains over 44,000 U.S. tons (40,000 metric tons) of structural steel, and almost an acre of office space per floor.〔(【引用サイトリンク】 title=U.S. Steel Tower )〕 Currently, the largest tenant of the building is UPMC who occupies of office space within the tower. In 2007 UPMC added signage to the top of the tower for the first time in its history, a move that was criticized by some involved in the construction of the structure.〔https://news.google.com/newspapers?nid=1129&dat=20070417&id=E-hRAAAAIBAJ&sjid=D3IDAAAAIBAJ&pg=2553,3049596&hl=en〕〔https://news.google.com/newspapers?id=mYdIAAAAIBAJ&sjid=JXIDAAAAIBAJ&pg=3263%2C3937988〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「U.S. Steel Tower」の詳細全文を読む スポンサード リンク
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