The Shard design - another Renzo Piano work, (1,016 feet) would register as a small fry, more than 20 stories taller than its closest rival, One Canada Square, 12 miles away at Canary Wharf. And while One Canada Square huddles in a scrum of office towers, the Shard rises all by itself in Southwark, a changing but still gritty area with few buildings more than 15 stories high.
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