Two places that might interest everyone:The Berkshire Mall outside Reading, PA - Not dead but 2/3 anchors recently closed. However, this place is interesting for the aesthetics which have not been altered since it was opened. The mall opened in the early 1970s and much of the architecture and finishes date from that era. There's also a lot of neon in the food court. Worth a look! Next is the Exton Square mall in Exton, PA. This was recently mentioned as a vulnerable mall in the Philadelphia Inquirer when they cited the owners who were discussing ways to prevent the mall from dying. https://www.inquirer.com/business/preit-malls-stock-earnings-exton-square-pennsylvania-20190220.htmlI've never been to the Exton mall, so I'm not sure what exactly the deal is there. Surprisingly the entire mall is covered in Google maps, so you can check out the interior there.
Hope that is of interest to somebody! If anyone wants to check either place out let me know. There's a lot of other stuff around SE PA as well, especially in some of the decaying factory towns around.