BusinessFace-to-face: Christoph Gröner To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoBusiness12/18/2018December 18, 2018As a student he worked on construction sites. Then he began buying real estate. Now he's a property tycoon. For anti-gentrification campaigners and politicians, he's Public Enemy No.1.https://p.dw.com/p/3ALLqAdvertisement