The four volumetrically subtly erected building components A to D were built in the transitional period from the 1960s to the 1970s. They showed typical features of that time, such as for example the emphasizing of the horizontal by strikingly designed window bands or recessed wall bases as well as of the vertical in the form of the staircase “loopholes“ at the front sides. In the 1980s, a first rather provisional facade renovation was carried out: as a contribution to minimizing deficits in terms of energy efficiency, an approx. 5 cm thick (or to be more precise, thin) rock wool insulation was installed and cladded with fibre-cement boards.
To change this unsatisfactory condition, the planning for a general facade renovation was started in 2013 by the renowned architecture office L3P Architekten (Regensberg near Zurich) managed by Dipl.-Ing. Arch. FH Mareike Beumer. Following this professional planning, the facades of three (at first house C, then B, then A) of the four buildings in total were completely renovated in the time from autumn of 2015 to summer of 2016. House D will follow at a later date not yet defined, as extensive measures in the interior have to be implemented there before and further details must be clarified.