Low mortgage rates have made buying a home more affordable and turned rentals into an attractive option for investors.

Throughout the downturn in the housing market, average investors, sometimes pooling their money, have bought foreclosures at a sharp discount and turned them into rentals. Many homeowners also have purchased a second home and rented out their first property.

Although the housing market is showing signs of recovery, demand for rental housing is expected to remain strong. The national unemployment rate remains high at 7.9 percent, banks are still working through a backlog of foreclosures and tight lending requirements prevent many renters from becoming homeowners.