WASHINGTON (MarketWatch) — Struggling to clear its inventory of foreclosed properties, the Obama administration said Wednesday it’s looking for investor ideas for converting more than 92,000 foreclosed properties owned by the U.S. government into rental units, a sign of the depths to which the U.S. housing market has sunk. “Exploring new options for selling these foreclosed properties will help expand access to affordable rental housing, promote private investment in local housing markets and support neighborhood and home-price stability,” Treasury Secretary Timothy Geithner said in a statement. The Obama administration is working with the Federal Housing Finance Agency, the regulator for...