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The new building consist out of a 30 cm thick concrete shell. It is a pile of 3 rotated boxes. The building is provided with only 11 columns, which are all placed with a certain inclination. There will be strong horizontal deformations due to the rotated positions of the boxes and the inclined columns. By adding an eccentric concrete core and by choosing well-defined positions of the columns, we have been able to reduce the deformations. An advanced 3D-model has been necessary to determine the short and long term horizontal deformations. We did also pay a lot of attention to the phasing of the form-work and the temporary forces.