facade renovation, around 500 horizontally pivoted windows with Forster steel profile systems were used, which were developed by an interdisciplinary team as functional all-rounders based on a historical model [...] horizontally pivoted windows were used here, which form continuous rows and are a defining feature of the facade's orthogonal, grid-like pattern. Over the years, however, these were replaced by tilt--turn windows [...] AG found the fabric of the building was in good condition. Three preserved box windows were also found, which were ahead of their time. The horizontally pivoted windows ensure good air circulation in rooms