Fisher Body Plant 23 is over the road from FB21, at Picquette and Beaubien opposite the Ford 'Model T' museum.

It looks empty and boarded up, as well. Has anyone seen inside it? It looks impenetrable. No windows or access points.

The area has its own Wikipedia page:

https://en.wikipedia.org/wiki/Piquette_Avenue_Industrial_Historic_District)

Fisher Body Plant 23 seems to be in much better shape structurally than '21 is.