 The first floor fenestration consists of a double row of windows, 22 in a row (that are hinged from the bottom, opening downwards), while the upper three only have one.The bold fenestration is enabled by the use of a solid reinforced concrete girderless framework with "mushroom form" columns that free the brick facade of its load-bearing function.The cross-section of columns on the last stage is much smaller than on the first one, it's because of the increase of mechanical tension down from the roof the basement.