Schwarzenbach set up Interexchange, the largest foreign exchange dealership in Switzerland.date=June 2017 Through its success, he has bought well over £300m of property in the UK, 123000 acres in Australia, a palace in Morocco, £17m of assets in the aviation field and the Grand Hotel Dolder in Zürich.date=June 2017 He also has his own polo team, the Black Bears, which has some 600 horses, with 350 in Australia and 250 in the UK.date=June 2017