[stonogo]

You won't get a source because it's misinformation. There are US cities wherein one in every three single-family-home purchases were made by investors last quarter: https://www.redfin.com/news/investor-home-purchases-q4-2021/ so perhaps OP was referring to that.

[onlyrealcuzzo]

I was gonna say - it's nearly impossible for the home ownership rate to be ~65% and 1/3 SFH also owned by institutions.

The vast majority of rental stock is not SFH, and the vast majority of rental homes are owned by mom & pop's.