My primary job is as a project engineer, and I do this daily with suppliers and clients worldwide.2) Fly in early in September/October to be physically present. 

Very physical and non-stop, but knowing we are hitting it hard for 3ish years will give us comfort. 100 times less stress than picky, greedy, can't make up their mind, wanting 10 changes a week, but not wanting to pay for it customers.

Physical damage to the property can make it worse but even then they can blame someone else.John Corey

and they are all over town, and i im pretty big believer in the rule"if you have to advertise it, its not as good as its craked up to be"for example you see on tv advertisements for people to go to massage therapy school and "get the career of their dreams" have you ever talked to a message therapist?

You're going to have to physically split the utilities between the two units.

As mentioned I had multiple health issues that resulted in 2 surgeries and months of bed rest and physical therapy.

This way you're not having to physically collect rent from them.

Assuming the money is used to benefit the country with things like infrastructural spending and responsible civic projects.Buying and holding physical shares of a precious metal does not add value.

Also, unless you know your area like the back of your hand, I think physically driving neighborhoods can be a great way to get to know the different areas.

Some lenders refuse to send mail to a PO Box.While not perfect, I do know people that have gotten away with a UPS Box as a physical address for years.Technically a PO Box is not a street address.