Here is another house: Langenrainstrasse 19. What surgery has eliminated the house from the map? The silhouette of the shown house no. 17 reflects the exact demarcation on the ground floor between the semi-detached buildings 17 and 19. They were both created together and probably entered all maps together. So, no. 19 was removed later, but how and why? The official government's map shows the truth at http://maps.zh.ch/?topic=CMS3ZH&scale=624&x=2706380.41&y=1240595.22&srid=2056 . Also Google Maps shows it at https://www.google.com/maps/@47.30768,8.8453,20z .