Inco Superstack vs Two Prudential Plaza

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The Inco Superstack in Sudbury, Ontario, with a height of 381 metres (1,250 ft), is the tallest chimney in Canada and the Western hemisphere, and the 2nd tallest freestanding chimney in the world after the GRES-2 Power Station in Kazakhstan. It's also the second tallest freestanding structure of any kind in Canada, behind the CN Tower but forward of First Canadian Place. It's the 40th tallest freestanding structure in the world. The Superstack is situated on top of the biggest nickel smelting operation in the world at Vale's Copper Cliff processing centre in the city of Greater Sudbury.

In 2018, Vale declared that the stack will be decommissioned and dismantled beginning in 2020. On July 28, 2020, Vale declared that the stack had been officially taken out of service, but would remain operational in standby mode for two more months as a backup in case of a malfunction in the new system, after which the dismantling of this Superstack will begin. In addition to further reducing sulfur dioxide emissions by 85 percent, the decommissioning of the pile is expected to cut the complex's natural gas consumption in half.

Source: Wikipedia

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Two Prudential Plaza is a 64-story skyscraper located in the Loop area of Chicago, Illinois, United States.

At 995 ft (303 m) tall, it's now the sixth-tallest building in Chicago and the seventeenth-tallest in the U.S., being only five feet from 1,000 ft, making it the closest of any building under 1,000. Built in 1990, the building was designed by the firm Loebl Schlossman & Hackl, with Stephen T. Wright as the principal in charge of design. It has been honored with 8 awards, including winning the Best Structure Award from the Structural Engineers Association of Illinois in 1995. At the time of completion, Two Prudential was the world's tallest reinforced concrete building. Its distinctive shape features stacked chevron setbacks on the north and south sides, a pyramidal peak rotated 45°, and an 80-foot (24 m) spire. The building is attached to One Prudential Plaza (formerly called the Prudential Building). With no spire, the building's height is still slightly greater than that of One Prudential Plaza's pinnacle.In May 2006, BentleyForbes, a Los Angeles-based property investment firm, run by Frederick Wehba and his family bought Two Prudential Plaza, along with its sister property, One Prudential Plaza for $470 million.In 2015, BentleyForbes defaulted on the mortgage for the towers on account of the terrific Recession and New York-based investors 601W Firms and Berkley Properties took control of the property after investing more than $100 million in equity to recapitalize. BentleyForbes, the former controlling owner of the towers, continues to have an interest in the owning partnership.The building is also the new home of the Chicago Tribune and tronc, Inc. after leaving Tribune Tower in July 2018.

Source: Wikipedia