The closer to broad ripple the more renters there probably are but also the more maintenance you'll have to do between renters due to their likely age range and lifestyle choices.

My wife and I have 4 kids between the ages of 6 & 12, so that also keeps me busy and limits my time.

When I do analysis for myself or my clients I like to see for location strong population growth, high median income levels ( national average is around 54k ) so I like 80k plus generally, low violent crime levels, strong economic county or city planning department, good absorption levels for existing retail inventory.If you drive an area and most all of the retail centers are at 50% no matter the age then the landlords will cannibalize each other in rents and you will have a long road to climb.

Our short term goal ( 5 yrs. ) is to acquire 20 properties which will give us a sustainable income by age 35.

It's great that you've already begun thinking about real estate at your age.

I would call real estate brokers up at age 15 and ask them the secrets to their success. 

You will have to pay the taxes and a penalty (depending on your age) but the SD IRA will no longer exist.

It seems to me however that in our modern age that if there really is a total collapse of the dollar then we would be in dire times.  

If they rented in their previous country, you might get a landlord verification. 

Additionally, we can not tell the ages, sizes, and number of bedrooms in each home.