Even as the economy picks up steam, many of the nation's malls and shopping centers are suffering a hangover due to changing consumer habits and the fallout from a massive building boom.

The outlook is especially bad for strip malls and other neighborhood shopping centers. Their vacancy rate is expected to top 11.1% later this year, up from 10.9%, Reis predicts. That would be the highest level since 1990.

In 2005, the mall-vacancy rate hit a low of 5.1%. For strip centers the boom-time low vacancy rate was 6.7% that same year.

Not all retail properties have suffered as much, especially on the high end. Large, publicly traded mall owners like Simon Property Group Inc. and Taubman Centers Inc., which tend to own top-tier properties, have trimmed their vacancy rates to 7% or lower and lifted their lease rates in the past year, buoying their stock.