The Sanahuja family is reportedly the frontrunner in the public auction to buy the £1bn HSBC head office in Canary Wharf, daily the Financial Times said. The Catalan family, through its investment vehicle Cresa, is said to have made the highest offer in the auction. The property was put on the market last February with a price tag of £800 mln (EUR 1.2 bn). Market watchers believe it could now fetch as much as £1 bn, becoming the most expensive office building in the UK.