CHARLOTTE, N.C. -- Malls, those ubiquitous shopping meccas that sprang up in the 1950s, are dwindling in number, with many struggling properties reduced to largely vacant shells.

On the low-income east side of Charlotte, N.C., the 1.1-million-square-foot Eastland Mall recently lost a slew of key tenants, including a Dillard's and, next month, a Sears. Sales per square foot at the venue fell to $210 in 2008 from $288 in 2001.

The...