The portable alarm (lasershield) that I use is billed to my personal credit card.

There are "portable dishwashers" that would plug in as described, but then you wouldn't install one of those under the counter.

That way you can exit deals much faster and stay flexible (and portable). 

I think that @Steve Maginnis has the best idea about using a portable generator.

Do any of you agents have experience with license portability?

Secure the doors and window - post signs - portable alarm that sounds and calls police - notify local cops to drive by often - turn the utilities on and pay someone to stay there.We have some of those neighborhoods in Baltimore - I feel your concerns.As a lender you might want to offer the property at public auction and offer 100% seller financing - this way you have a loan back on the books and an asset protected.I represented a lender in Baltimore who had a bad loan and a pending foreclosure, the defaulting mortgagor gave the bank a deed, we advertised it for an auction with 100% lender financing - We had 80 people at the sale bidding against each other to get the building.

We provide a tower fan, but no portable AC unit.We're thinking about buying portable AC units, but are looking for tips on how to monetize it correctly.

And sometimes the numbers aren't exactly portable.  

You should only have it running when someone is there and/or use portable heaters for heating quickly and directly where the work is being done.Also, may want to consider looking for a leak somewhere if making those changes doesn't move your bill down.

Compound miter saw and a portable table saw.