Spanish billionaire Amancio Ortega, the founder of clothing giant Zara, has built up a global real estate empire that includes offices used by Facebook and Amazon in Seattle and large swathes of London's Oxford Street. Diversifying his fashion fortune to preserve his sizeable wealth, the value of the real estate portfolio owned by Ortega's investment holding, Pontegadea Inversiones, stood at around €10billion (£8.6billion) at the end of last year. Pontegadea ...