I unexpectedly began my real estate investing/rental property career in 2007 after a job transfer forced me to quickly become a landlord. 

Your client is requesting to be CC'd on all communications (Client wants his email address in confidential notes to be CC'd for fast response to any offers/counters) .

Over the years, I was involved in number of cases where folks suddenly had to face a huge liability because they didn’t realize this fact.Finally, since you mentioned that you don't live in the states, I would double check the law of the country you currently live in to see if there are any restrictions on the amount of money you can transfer.

I moved from FL where all our family was to NH in 2011 where my husbands job transferred him.  

First, make sure you get the deposit transferred to you at closing.  

I understand the whole "due-on-sale" clause and I'm fairly familiar with company formations and how to document a transfer of property.  

Do i need to transfer properties to a TRUST, S-Corp or LLC from preventing any lawsuits?

The funds will take some time to transfer, though, once you've been paid, so I would encourage you to pay the small monthly fee to expedite them.

I read the Arizona state laws that I can transfer the lien to someone.

That means they need to open an account in US then they can transfer money.As foreigners, people normally will ask the tax related investment.