The first thing I think with "cheap <industrial>" is "superfund". I hope no one ever did any work with electroplating, pharmaceuticals, pesticides, VOCs, asbestos, explosives, PCBs, or any other fun stuff that will come back to haunt the current owner.
Agreed. Hopefully, OP got the inspection and testing done before buying the warehouse. Also the purchase agreement doesn't absolve previous owner of any previous environmental contamination and cleanup costs.
So you bought something without really thinking it through.
GOOD WORK!!
If I were you I would look at increasing its value then selling it on as quickly as possible. You obviously dont have the vision or mentality to be an entrepreneur.