Hard for anyone to know what surprises will be uncovered which is why your budget and your schedule need to accommodate the unknown. 

Since you are investing in unknown assets when you send in your money, you are unable to underwrite the deal yourself. 

Somebody wanting to sue for you backing out of a bad deal or accusing you of selling them a property with defects like unknown termite damage).

.- "Skip Trace" the address to get the owner's public information (from several unknown data sources) There are several companies / applications that do skip tracing.

I am trying to build trust worthy sources to help me identify the 'unknowns' in out of state markets I am unfamiliar with..

Also a huge unknown of mine is the taxes you pay on income with real estate investing and LLC's, etc. 

Personally I avoid them as it creates one more hurdle and potential “unknown factors” for your job site.

C Class for that price it's not all occupied which if you plan to physically go there and rehab and on site manageYour likely comps: With C class you need agent who goes there at night to monitor.15300 Waterloo Rd Cleveland OH $300000   C897 E 105th St Cleveland OH $420000 C3421 E 134th St Cleveland OH $550000 10.8 CAP CLorrain Cleveland $299000 unknown income3259 W 25th Cleveland  $280000   C

But still investors have the choice of buying a 4 cap building in Silicon Valley vs a 15 cap in some unknown Midwestern town. 

Which sounds fine and dandy, but it obviously comes with these unknown risks.