correspondingly poor thermal insulation, all windows were replaced in the 1980s by better insulated, plain tilt-and-turn windows. Faithfulness to the original As the formerly highest building in Bavaria, the high-rise [...] coated with a UV-resistant, light shade. The pivoting windows are closed by means of four-sided fittings, which lock into their outer frames all around and tighten on all sides. This was the only way to [...] problem to maintain the original character with a contemporary thermal insulation: The glass facade was tilted inwards in line with the original. In addition, the outer profile strips still show the heads of