The one in Beatenplaz, right next to Restaurant and Bar Movies. Beatenplatz is actually a quite nice place to sit outdoors during the Summer and have a gespritz, courtesy of Movies. Other than this, there are a few government offices on this massive grey building, like the (in)famous parking regulation one. All in all, an unusual space and unusual architecture for Zurich standards.
Zurich 1200 Fountains 