A traditional bank would had not given me the loan amount needed to purchase & rehab (203k loan).  

@Christian Wathne I see your point. 

Seller financing is not a bad idea, will probably attract investors as well as those who have poor credit scores and can't get traditional financing.   

I don't think I could even qualify for any traditional financing, as I'm 23 years old and got my real estate license about seven months ago, and I've yet to generate a steady income, but on the plus side I do have an immaculate credit score...Anyway, I plan on buying a condo at a judicial sale in Chicago this month.

However, my instincts say that an invitation style is more likely to be opened than a traditional long letter envelope...........just sayin

If I intend to re-finance into a non-owner-occupied traditional mortgage after some time, should I then analyze the deal with the aforementioned standard financing terms?

The property has some exterior issues that will most likely prevent us from obtaining a traditional landlord or home owners insurance policy.

That would depend on how you define a "series LLC", as it is not a traditional common law entity.

As far as the back to back closing make sure the end buyer is not obtaining traditional bank financing otherwise the deal is dead.

When you have cash to offer a seller, with no financing contingency, the only person that comes in stronger is a big jump in traditional down payment buyer offer or another investor with more cash.Cash in buying a house works like cash works just about anywhere else.