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    Should this be done iteratively until there are no more building to merge? Commented Dec 3, 2021 at 17:12
  • You could create a new attribute for each condition with true/false and then identify those with all of these conditions = true. By the way: which "Join" command in QGIS do you mean? Only polygons that border (touch) each other should be merged, right? Commented Dec 3, 2021 at 17:54
  • I belive this problem is very complicated. Maybe some kind of cluster analysis could work Commented Dec 4, 2021 at 10:16
  • Thank you for all the comments. I tried adding more details in the question to be more specific. Commented Dec 4, 2021 at 15:09