From Green Street Advisors report
The single-family rental (“SFR”) market comprises ~13% of all occupied housing and ~37% of the
total rental market.

http://www.rentalhomecouncil.org/media/Green-Street-Advisors-Single-Family-Rental-Primer.pdf

“The Atlanta area had the highest concentration of rental homes owned by five of the largest single-family-home companies in June 2017”