Attempting to place a fireplace in the second floor chimney of this building:
I could not get the option to place it. The first floor chimney works fine, however.
I don't know if it was an issue with my character, or just this particular building, or all instances of this building type. I plan to try it again at this same building type in a different location.
Edit: Tried this at a different instance of the same building and had the same issue.