Heron Tower vs Kennecott Smokestack

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Salesforce Tower, 110 Bishopsgate (formerly Heron Tower) is a commercial skyscraper in London. It stands 230 metres (755 feet ) tall including its 28-metre (92 ft) mast which makes it the tallest building in the City of London financial district and the third tallest in Greater London and the United Kingdom, after the Shard in Southwark and One Canada Square at Canary Wharf. 110 Bishopsgate is located on Bishopsgate and is headquartered in Camomile Street, Outwich Street and Houndsditch. Construction of the building started in 2007 and has been completed in 2011.

It's owned by Heron International and is still popularly known as Heron Tower, though following a naming dispute in 2014 involving the tenant Salesforce.com that the City of London planning committee made it clear they would rule in favour of the property being officially named 110 Bishopsgate, even though the application was withdrawn before it went to committee. The tower originally struggled to attract tenants at the depths of the Great Recession, but is now fully let.

Source: Wikipedia

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Kennecott Utah Copper LLC's Garfield Smelter Stack is a 1,215 Ft (370 m) high smokestack west of Magna, Utah, along with Interstate 80 near the Great Salt Lake.

It was constructed to disperse exhaust gases from the Kennecott Utah Copper smelter at Garfield, Utah.

Source: Wikipedia