This first building is very interesting, because at street level it’s very plain. On the upper floors, however, it features irregular but extremely rich decorations. Except on one side, that is, which is left without decorations at all. Furthermore, unlike most buildings on this street, this one has a flat roof.
My guess is that this building was partially damaged during World War II (roof and left side) and as building materials were scarce when it was rebuilt, it became what we see today.