Then, in the first two decades of the 20th century, he underwent a conversion, embracing the modern world around him with fervour.

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The modern company that inherited it, Garanti Bank, has funded its conversion into a stunning arts and banking archive known as SALT.

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Before going to Aix, Gelb stopped in Basel to meet with the Swiss architects Jacques Herzog and Pierre de Meuron, best known for their conversion of the Bankside power station, in London, into the Tate Modern.

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