<i>Just curious: do these folks have any id?</i><p>Some do, many don&#x27;t.  Either way doesn&#x27;t say much about where they were living 2 or 20 years ago.<p><i>Could we perhaps google them vs housing records, property deeds, or other public information and determine if they used to own or rent in SF?</i><p>You &quot;could&quot; but it would be a pretty bad idea -- it&#x27;s safe to assume most of these people weren&#x27;t ever property owners, and (if they did rent) lived in regular privately-rented dwellings, i.e. with no public record.