No foreigner can have had such an impact on Prague in the modern era as Serge Borenstein. Indeed in three and a half decades, the Belgian-born developer has been behind new constructions totalling a remarkable half a million square metres in and around the capital. His most notable projects have been in Karlín, a district he has almost single-handedly transformed with a series of gleaming office buildings. And it was at Borenstein’s offices there that we spoke recently.