I would start with some good land lording practices, some DIY prevention, and in parallel a call to a mold remediator.Good land lording practice would be to explain humidity and temperature combine to make mold grow.  

As a result hes asked me if I'd be interested in getting an LLC and putting the warehouse in my own name and our company renting the warehouse from "my company". 

With prices up by that much this quickly, I'm sure you guys can understand why I'm being cautious about jumping in without checking the temperature of the water first!  

1) Don't buy 2nd's unless you know what you're doing (which you probably don't).2) Don't forget to check for all the other liens that might stay with the property, but do make distinctions between liens that stay with the property and liens that don't.3) Don't by sight unseen unless you're trying to place a ridiculous amount of capital and you can make it up on volume.4) Don't buy without determining occupancy status and the "temperature" of the occupants.5) If the guys that show up every day are bidding on something, you probably can't make it work on your margins.6) Don't get emotional.7) Seriously, don't get emotional.

I personally don't have any experience with this company, but something like Renter's Warehouse might be a good option for you.

its hot always.. temperature and just business attitude.

Even when we put ‘governors’ on the temperature, we found open windows.

I have a 5000 sf commercial building that is somewhere between office and retail and warehouse.

The good news is I came into a potential windfall in the form of a warehouse full of cheap to me (gas/time spent hauling it) AV equipment.

You also have similar cash back cards like the Chase Freedom card that offers 1% cash back on every purchase, and 5% up to $1,500 on rotating categories(home improvement is usually one, gas stations, warehouse stores, etc.) biggest perk to a card like that is the 15 month 0% interest and a $150 bonus when you spend $500 within the first three months.