Online retail sales keep climbing, big box retailers keep wondering what to do with all their space, and small stores struggle to survive at all. As a result of that nasty brew, Malls Face Surge in Vacancies. Mall vacancies hit their highest level in at least 11 years in the first quarter, new figures from real-estate research company Reis Inc. showed. In the top 80 U.S. markets, the average vacancy rate was 9.1%, up from 8.7%. 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,...