If you look at the aerial photo (pic #17), the neighboring unit on the right has a matching(?) bump-out. I think the unit on the left has done an addition, but I think this space might be original (although maybe it didn’t originally have a toilet in it).
Wouldn’t be surprised if the toilet was a later addition and simply tacked onto the back. I believe that wasn’t unheard of.
If you look at the aerial photo (pic #17), the neighboring unit on the right has a matching(?) bump-out. I think the unit on the left has done an addition, but I think this space might be original (although maybe it didn’t originally have a toilet in it).