Carlton Centre vs Heron Tower

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The Carlton Centre is a 50 story skyscraper and shopping centre situated in downtown Johannesburg, South Africa. In 223 metres (732 feet ), it is the second tallest building in Africa following The Leonardo and the tallest office building. The foundations of both buildings in the complex are 5 m (16 feet ) in diameter and extend 15 m (49 feet ) down to the bedrock, 35 m (115 feet ) below street level.

The building houses both offices and shops, and has over 46 percent of the floor area below ground level. The Carlton Centre is linked to the Carlton Hotel by a below-ground shopping centre with over 180 shops.

Source: Wikipedia

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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clear they would rule in favour of the property being officially named 110 Bishopsgate, even though the application was withdrawn before it went to committee.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