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The Aon Center (200 East Randolph Street, formerly Amoco Building)[3] is a modern supertall skyscraper located in the Northeast corner of the Chicago Loop, Chicago, Illinois, United States. It was designed by a partnership between architecture firms Edward Durell Stone and Perkins and Will and was completed in 1973[4] as the Standard Oil Building (nicknamed "Big Stan").[5] With 83 floors and a height of 1,136 feet (346 m), it is the fourth-tallest building in Chicago,[2] surpassed in height by the Willis Tower, Trump International Hotel and Tower, and St. Regis Chicago.
The building is managed by JLL, which is also headquartered in the building. Aon Center houses the headquarters of Aon, Blue Cross Blue Shield Association, and Kraft Heinz (BCBS and Kraft Heinz each have a second headquarters, located in Washington D.C. and Pittsburgh respectively);[6] the building formerly served as the world headquarters of Amoco prior to its merger into BP.[7][8][9][10]
The building was briefly the tallest completed building in Chicago, but was soon surpassed by the Sears Tower. It was the fourth-tallest building in the world at the time of its completion.
スタンダード・オイル・ビルは、インディアナ州スタンダード・オイル社の本社として建設されました。スタンダード社の以前の本社は、サウス・ミシガン・アベニュー910番地でした。この建物は1911年にカーペン・ブラザーズ家具会社によって建設され、1927年にスタンダード社によって購入されました。新しいスタンダード・オイル・ビルが1973年に完成したとき、シカゴで最も高い完成ビルであり、世界で4番目に高いビルとなり、「ビッグ・スタン」という愛称を得ました。[ 11 ] 1974年には、シカゴのより高いシアーズ・タワー（現在のウィリス・タワー）が、シカゴで最も高い完成ビルとしてスタンダード・オイル・ビルを上回りました（シアーズ・タワーは世界一の高さでもありました）。しかし、シアーズ・タワーはすでに1973年5月に最上階に達していました。 [ 12 ] [ 13 ]エイオン・センターが世界で4番目に高い完成ビルとしてオープンしたとき、その高さは、元のワールド・トレード・センターのツイン・タワーとニューヨーク市のエンパイア・ステート・ビルディングにのみ及ばなかった。[ 12 ]元々大理石で覆われていたAonセンターは、世界で最も高い大理石張りの建物でもあった。[ 13 ]
この建物は、耐震性、揺れの軽減、柱の曲がりの最小化、柱のない空間の最大化を図るため、V字型の外周柱を備えた鋼管フレーム構造を採用している。この工法は、ニューヨーク市の旧ワールドトレードセンターのツインタワーにも用いられた。
When completed, it was the world's tallest marble-clad building, sheathed entirely with 43,000 slabs of Italian Carrara marble. The marble used was thinner than previously attempted in cladding a building, which soon proved to be a mistake. On December 25, 1973, during construction a 350-pound marble slab detached from the façade and penetrated the roof of the nearby Prudential Center.[14] In 1985, inspection found numerous cracks and bowing in the marble cladding of the building. To alleviate the problem, stainless steel straps were added to hold the marble in place.[11] Later, from 1990 to 1992, the entire building was refaced with Mount Airy white granite at an estimated cost of over $80 million.[5][15] Amoco was reluctant to divulge the actual amount, but it was well over half the original price of the building, without adjustment for inflation. Two-thirds of the discarded marble was crushed and used as landscaping decoration at Amoco's refinery in Whiting, Indiana, one-sixth was donated to Governors State University, in University Park, and one-sixth donated to Regalo, a division of Lashcon Inc. Under a grant from the Illinois Department of Rehabilitative Services, Regalo's 25 handicapped workers carved the discarded marble into a variety of specialty items such as corporate gifts and mementos including desk clocks and pen holders.[5][16]
The Standard Oil Building was renamed the Amoco Building when the company changed names in 1985. In 1998, Amoco sold the building to The Blackstone Group for an undisclosed amount, estimated to be between $430 and $440 million.[5][11] It was renamed as the Aon Center on December 30, 1999, although Aon would not become the building's primary tenant until September 2001.[17] In May 2003, Wells Real Estate Investment Trust, Inc. acquired the building for between $465 and $475 million.[5][18] On August 10, 2007, Wells Real Estate Investment Trust, Inc. changed its name to Piedmont Office Realty Trust, Inc.)[19]
Real estate investors Mark Karasick and Victor Gerstein acquired the building from Piedmont in 2015 for $713 million.[1]
2018年5月14日、建物の所有者は、スカイサミットと呼ばれる屋上のスリルライド、世界一高い屋外エレベーター、新しいエントランスパビリオンを備えた展望台の1億8500万ドルの計画を発表した。展望台は2022年に完成予定だったが、COVID-19パンデミックにより建設計画が約1年遅れると発表された。[ 20 ] [ 21 ]
