If they come back to claim it some day, charge them for storing it on your property the entire time.

The area is Burlington,NJ off Rt 541 next to a ghost mall prime major retail stores walking distance from condo.

@Megan HodgesI might suggest Anson Young's book, Finding and Funding Great Deals:https://www.biggerpockets.com/store/finding-and-funding-great-deals-ultimateThat could help get your mind moving if you haven't read it already.

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

@Josh GoldIf you haven't read David Greene's book on out of state investing, that might be a good place to start.https://www.biggerpockets.com/store/long-distance-real-estate-investing-ultimateFirst hurdle you'll need to overcome is the need to self-manage.

Yeah, there is an attic and a locked closest, so we could store them right in the house. 

Buy from the thrift stores.

Without the demand for climate storage and another big box stores, and with multi-family redevelopment of these buildings likely being too expensive to be profitable, does anybody have any ideas (or better yet examples) on how to take advantage of this large onslaught of vacant space? 

Search sites - Mobile home park store, CREXI, loopnet, Occasionally you can find one in Craigslist You can buy lists of parks from ListSourceReonomy is a subscription site to search properties and owner info.

Can you give them the credit card and have them run it like at a store, no.Could you get a cash advance and use that Cash, yes.