While the external baffle plate is made of hardened LSG glass, the thermal insulation is provided by the triple insulation glazing, which is located in the inner inspection sash. All panes are untinted; [...] preservation of historical monuments but without sacrificing modern requirements such as thermal insulation and durability. The Plärrer high-rise building was completed in 1953 in the almost completely destroyed [...] characterised these two components. However, due to the single glazing and correspondingly poor thermal insulation, all windows were replaced in the 1980s by better insulated, plain tilt-and-turn windows. Faithfulness