65% of houses are with a mortgage in the USA from latest census data. About 40% of homeowners have no mortgages. About 16% of these own second homes or more. So yes there is around 45-55% with mortgages and 40% paid off in first homes. The more than one home owners are relatively small amount of mortgages, more cash, helocs or investment capital. One of the more interesting parts of the graph is 2006 where you see a record low number of delinquencies too. People feel safe with properties despite negative news of recession and higher interest rates. It feels like we’re here in the timeline where people are over extending into multiple homes but we could see another large bull run before any collapse. It could be months (doubtful) but more likely years