The overall design concept was based on the box-of-bricks principle consisting of spatial units. The position of the vertical staircase dictated by the hall’s presence defines the layout type featuring an open horizontal corridor. There are sandwiched ´volumes´ between the layers of floor slabs, by their size corresponding with apartment units. There where the mass volume must be made less dense conforming it to the neighbouring buildings, where more natural light and air must be let in, where an untraditional open space must be created allowing contact between people, the bricks are left out.