As in Berlin, the two monumental service ducts in the square hall are clad with Greek Tinos marble, and visitors familiar with the Neue Nationalgalerie will have a déjà-vu experience on en- tering the bank. A further similarity between the buildings is the large column-free universal space covered by a grid of steel roof trusses. The advantage of this method, which required the utmost precision, is the low self-weight and construction depth of the roof structure; its disadvantage the high assembly costs, which Mies was nevertheless willing to accept in order to achieve the desired impression of lightness. He declared, “we have steel. I think that this is a fine material. By fine, I mean it is very strong. It is very ele- gant. You can do a lot with it. The whole character of the building is very light. That is why I like it when I have to build a building in a steel construction. What I like best is when I can use stone on the ground.