After the relocation of the government Berlin became the capitol and political centre of Germany again, the unavoidable question about urbanistic requirements as a European location and the commitment to cultural and clerical metropolis Berlin comes up. Then the talk about the Berlin city silhoutte belongs to this and also the memorable markings of extra ordinary places of the city. Besides the main centres like West-City, Potsdamer Platz and Alexanderplatz, the destinctive situation around the railway station Friedrichstraße is counted among them, also in the context of  the not unproblematic appearing Tower building of the IHZ. The construction draft of the tower building on the Spree triangle at the Friedrichstraße is seen as a thesis for a densely construction on this special property.