Since the pivoting windows only need to be opened by about 12 cm, the shearing angle is just 7.5°, which means low torsion for the low current cable integrated in the pivot bearing. The pivoting frames are [...] the faithful restoration of the filigree pivoting casement windows, which gave the appearance of the building its special flair. Tenders were invited for a "pivoting composite window with integrated sun [...] protection and an internal pivoting sash for inspection and cleaning work, with a closed pivoting function". Jürg Egli, Head of Property Management at Forster Profile Systems, explains with a grin that