The Z1 entrance building has a transparent glass facade with a dark aluminium balustrade that, with its subtle play of lines, is transformed into large overhanging roof areas on the ends of the building. In this way, storey-high glass facades are created to provide maximum views. The ground floor has a greater storey height and a deeper exterior wall line. The entrance is situated in the middle of the building on the axis of the entrances of the other buildings. At ground level, special attention has been paid to the materials used and the inclusion of a variety of functions: a public table feature has been created on the entrance side, while two ramps on the long side of the building, between the lines of the exterior walls, the parapet and the main structure, provide access to the car park. The south side has a patio, and the terrace to the south has a natural stone balustrade that allows daylight into the basement restaurant area. On the north side the balustrade is extended in safety glass and planted areas.
Office areas are located on the north-west side of the ground floor and the entire first and second floor. These office areas have a flexible layout thanks to the central entrance core.