How is that set up and is it a pretty smooth transaction? 

With $330/m in cash flow, unless you have sufficient reserves set aside those funds should remain as liquid as possible in the event of repairs or cap ex.

Don't try to set it and forget it.

Set a utility usage cap that is stated and agreed to in your lease agreement.

No one  (aside from ideologues) seriously considers bitcoin a currency anymore, and there are secure ways to store your bitcoin using hardware wallets but it's tough to convince normal people to do it which I think will hamper it's adoption.

Aside from the increased rental value, properties that are on water, or have a view of the water, are going to appreciate in value at a higher rate than the others.

Unfortunately, aside from that, it was mostly brag talk about his portfolio, how he was firmly anti-debt, and how much money he had coming to him from his CDs that he was going to use to develop--you would have guessed it--another warehouse.

@John R Bongiovanni Aside from those services, I have done a lower security deposit in exchange for a higher rent on a long term tenant and they were fine with that.

All fancy footwork and tricky strategies aside (insert sarcasm)... the ultimate solution is to pay it off if it gets called due. 

And if it were set up where everything went through a title company so the buyer pays the title company, they manage the buyer's loan (from me), and the title company ensures my mortgage is paid without my direct involvement... what parts of the transaction would feel risky or not worth the headache to you?