Sort of, depending on what fuzzy logic we include into the single family metric (which I would say is significantly less than 33m paid off mortgages we view as a normal single family home)
We get in my mind roughly half of “paid off” mortgages as being held by some type of investor. More fuzzy if you try to desern which are owned in proxy or foreign owned, let alone which are pure corporate.
So the reality is it’s likely only about a max of 18% of mortgages that are actually liquid without some type of encumbrance to freely move, add in the wide range of other legal encumbrances and even HOA bilaws and that number is likely even smaller for the free and clear owner lived in houses.
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That said these investor owned, including the place I rent are most likely to dump into the market without warning at a large loss tossing the renters into the street as many areas still lack any meaningful amount of open rental property.
Graph matches what I've heard. Individuals rather than large corporations hold the majority of single family rentals.