When we started out, we didn't really think that the era of great opportunity would end one day. We were much too busy developing our companies. But in today's China you can build a city, even a mega-city like Beijing or Shanghai, within 10 or 15 years. And then you are done. So in real estate development, the Gründerzeit is over. But that is not the case in other sectors.

Country [China] needs to continue opening up and keep connecting. It needs to realize that the world has become one. The old concept of isolation, the idea that you can solve your problems on your own does not work anymore - neither in cultural, economic, nor political terms.

No economy, no company, in fact no individual can develop its full potential today without embracing two fundamental trends - globalization and digitalization. They will dominate for quite some time to come.

Isolation means a lack of growth. I grew up in China at a time when the country was completely isolated. That era is over.

Because people along the route had realized that there was demand and quickly organized supply. That's so Chinese. In a well-organized country like Germany, such a problem may not have arisen in the first place, but in China people immediately recognized an opportunity.

It is worthwhile to engage in something that is close to one's heart. I had a scholarship. So if I donate money to give brilliant Chinese students an opportunity to study abroad, then this embodies everything I believe in: education, globalization, social mobility. I am an example of social mobility.

Our tenants now are companies like Uber, the taxi service, Meituan.com, China's version of Groupon - and a large number of startups. These companies operate in a modern way, just like their customers: They go on the Internet, look for an offer and take it.