These pictures aren't proper proposals just studies. The problem with Berlin's future skyscrapers is that current vacancy rates are too high and the rents are too low. As long as the real estate market has not recovered this skyscraper planning is nothing more than a vision.
Love that new Hauptbahnhof they are building, I got off at it last year, and part of it is already up. Only problem is that I heard it won't be finished until 2020!
Now that's one slow construction. Maybe I read wrong, or it was a misprint - I certainly hope so.
Only problem is the fact that its quite literally in the middle of nowhere. It will be a crucial north-south + wes-east axis connection, but the business development that will be built is not required in a city that quite simply has far too much vacant office space. It should have been built in Mitte.