By Richard Horgan Los Angeles (Knewz) — In the first quarter of 2022, ATTOM found that gross rental yields for landlords on three-bedroom single-family homes, before expenses, decreased in 72 percent of the 212 U.S. counties analyzed. Most declines were infinitesimal, less than one percent. But it is a drop for a red-hot rental market, with ATTOM estimated profit margins down for the most part to below seven percent. “Investors who own single-family rental properties have seen their margins compressed over the last year as home prices have risen faster than rental rates,” said Rick Sharga, exe…