I think geographical diversification is very prudent for the very reasons stated by @Marco Santarelli .Another reason: natural disasters (which seem to be more frequent nowadays).

If you are uninsured usually you can negotiate away a large part of the bill to settle it.Medical companies do not want to chase for money they would rather settle in many cases for cash today and move on.Did you go to an emergency room or have a procedure performed at your doctor's etc.??

Our insurance provider also penalizes us for oil heat.When we are putting together an offer on a property with oil heat, we price in a conversion to either electric (heat pump) or natural gas.That said, we have ended up running a property with oil heat prior to conversion and, while the tenant was responsible for the heating costs, we coordinated the oil delivery - given we received a 5% discount as a result of our affiliation with a local apartment owners association, the Tenants were keen on the arrangement.

I don't want tenants using the attic for storage since this area contains the HVAC, water heater and natural gas lines.

A natural resource boom can be shifted by world/political events, economic changes, environmental considerations, etc.

Bonds, stocks, gas, natural gas, etc.

RE: Eminent Domain/Condemnation - Check the laws and procedure for a municipality to condemn a property in your state.

I'm 24, started getting educated financially at 17 and RE seemed like the natural progression.

Being a Red Sox fan I naturally despise the Yankees.

I guess that just goes to show what a country can do when it has natural resources and actually uses them.