Hello,

"historic=city_gate" is a very specific tag for OSM, and is usually found on former city walls.

As far as I can see, there is no such situation here.  Can you please confirm this is something you really saw while going there?  Did you take pictures or know about documents confirming there is a "city gate" in this neighbourhood?  Aerial imagery suggests there might be some kind of "gate" but probably a more common type.  Pictures could be of help.

Thanks in advance.