Hello! Yes this was a mistake. I am unsure if I mistakenly added the tag or if it was there previously. I think it is safe to remove the office tag altogether. I drove by the other day, it is Station 2 of the Oxford Fire Department, I think that was what the tag could have been referring to?

You are correct! I was unaware how to get Wikidata ID from a Wikipedia page, so I looked up 'Clara Barton birthplace' on the Wikidata site and was not careful about getting the correct ID. I've since found the proper ID and have corrected it!
Thanks for noticing

I marked based on imagery, the road in the section mentioned appears too dark to be unpaved, and to my eye seems to have a painted line - This is something I can check in person tomorrow to be 100% sure