Reminds me of a certain Hitchcock film, Then There Were Three. :-)
X doesn't mark the spot
Very puzzling to me.My SIGNS, SIGNS
I think it would be a little eerie to be the only 3 left in the building, if that is the case.
Maybe they have just had enough junk mail :).
My goodness -- looks like a lot of turn-over in that apartment building. (Or maybe the tentants just don't want company.)