To add to the exploring old buildings part of this thread, this converted building has lots of space for this. There is a basement, and then a sub-basement. The original warehouse was powered by DC, and the generators were located in this sub-basement. These things were huge. So large, that in order to remove them, they had to be cut into pieces. The building had been expanded, with the new addition being made into an actual retail Sears store. They had 2 underground floors, and being a show room had terrazzo flooring. These underground floors have now been converted into parking which totally hides the design of the terrazzo, and very few people even look at the floor of a parking garage to even notice.
(The headline is a bit misleading. Most of the article is about efforts to revitalize the theater.)
In this case, someone did eventually undertake restoring it so it's not actually abandoned.