describes as ‘the looniest episode in 15CPW’s short history’ came in 2013 when Citigroup’s ex-CEO Sandy Weill sold a penthouse for $88 million, having bought it for precisely half that just six years previously. The purchaser was the Russian fertiliser tycoon Dmitry Rybolovlev, who was at the time going through a messy divorce (which ended up costing him $6 billion)

