Landlords purchasing three-bedroom, single-family homes this year are seeing a decline in their gross rental returns before expenses, a new report says Friday. ATTOM, which curates real estate data nationwide, analyzed single-family home rental yields in 212 U.S. counties with a population of at least 100,000. The report shows that average gross rental yields before expenses on three-bedroom, single-family homes purchased by landlords this year decreased in 72% of the counties surveyed in the report.