Gordon is the owner, I doubt whether he could completely hide behind his LLC to protect personal liability. 

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I don't have personal experience with it, but when the app was first developed, I contacted the developer and put the app through a fairly robust test usage to see if it's something I would want to recommend to my clients (I'm a CPA).I think the app is great for its intended purpose and I do recommend it to my clients now (and have for about 18 months now). 

It's not a personal sale between you and your son, but rather a sale from one LLC to another.

I would start close to where you live personally. 

If a person wants a different outcome, they usually do something different.

Will you need the equity in your primary home for any future personal expenses?

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Quote from @Allen Berrebbi: Quote from @Dominic Mazzarella: I have personally owned and managed a multifamily property in Illinois and after selling it I said I would never invest in that state again.

The question is mostly a personal financial planning question and it depends on your preference and what balance of risk and access you'd like and would be comfortable with.