As Yglesias points out, we should LEAVE JOHN MCCAIN ALOOOOONE on the subject of his houses because when you buy multiple condos and combine them the question becomes fraught with difficulties hitherto unknown outside of quantum physics.
My crib has a bricked up door-like structure which quite likely was once the passageway to a 1920s speakeasy. I do not own that, however, and so I can confidently state that I own only one home.