adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-BUSINESS","nativepaywallcategory" : "NATIVE_PREM-BUSINESS"};It's no secret that the rise of online shopping has altered the retail landscape in a big way. But the recent announcement that Sears and Macy's plan to close many more stores is increasing concern about the future of the malls that they anchor.