Some of the biggest names on Wall Street are lining up to become landlords to cash-strapped Americans by bidding on pools of foreclosed properties being sold by Fannie Mae.

The idea is that the new owners would rent out the homes at first rather than reselling—potentially aiding a housing-market recovery by reducing the number of properties clogging the market. The fact that big-name investors are interested also suggests they anticipate sizable future profits in housing.
Fannie Mae's Foreclosure Announcement

Bulk sales, however, pose a trade-off. While the current approach of selling homes one-by-one has its own high costs and is sometimes inefficient, selling properties in bulk to large investors could require Fannie Mae to sell at a big discount, leading to larger initial costs.