This new building is one of the most energy-efficient and sustainable office buildings in Belgium, having an E-level of 82 and a K-value of 33, according to the Belgian Energy EPB norms. The comfort of this building is guaranteed at a very low energy cost, first of all thanks to the sustainable building envelope, having a very high isolation of the walls ( U-value below 0,35 W/m2.K) and the roof ( U-value of 0,28 W/m2.K).