Too many unknown variables (i.e. age of property, condition, market cap rate, seller motivation, owner financing terms, upside in property, etc.) in play to give more concrete thoughts. 

The reason for this is to protect oneself from unknown liability.  

Hi everyone,I'm severely new to real estate investing and and ran into an unknown.

Too many unknowns.

about how much in re hab costs besides the unknown structural issues.  

Once the refinance is done with a 20% down payment and depending on current interest rates in five years, the cash flow should experience a measurable increase.I'm aware there's a risk of the DOS clause being called, the unknown factor that their mortgage payment might be higher than I've figured if they've done any refinancing since purchasing the property and that interest rates are at times volatile so in 5 years my cash flow may not increase at all.

Stuff like that.While it can be hard to quantify, as Rumsfeld put it, the unknown unknowns, how comfortable are you feeling right now with what you need to do and what your next step would be?

They don't have to, someone else with experience will buy the lot without having to do much due diligence.But a parcel with unknown development rules that has been sitting for a while?

"random people living there, that werent authorized"Forget all the other stuff you just said.I don't know about in your state but mine in GA you have to file a separate action that says "and all others" when doing the eviction.This covers all unknown people over 18 years old not on the lease.

The first time you step into some unknown substance you'll be grateful for the extra protection.