The Uniqua Building on the opposite side of Urania at the Donaukanal, is one of several modern skyscapers (by Viennese standards) that have been built in this area - another one is Hans Hollein's Generali Media Tower. The most striking feature of the Uniqua Building is its lighting system. All the lights on the outside are computer controlled and can be lit in all colours. What cannot be seen on the image is that it was snowing heavily when I took it.
See more images of this and other modern buildings in Vienna in my gallery Patterns of Modern Architecture