@Jessica FreeseLendingHome should be able to lend to individuals; they just charge a higher rate for it.For the EIN requirement, are you saying like get an EIN as a sole prop? 

However, my concern is that if I purchase all four as separate entities (which I think is the smartest way to go so I can sell later with no problems), the closing costs of each individual purchase (total of four) is going to be crazy.

I have no mortgage on the property and it generates about a $6k surplus each year.When my current tenant moves out, I'll have to re-carpet and re-paint, maybe renovate kitchen.My question is, since all the appliances are original (and still in good working order), when this tenant moves out and I do my renovations (mentioned above) should I sell it before some of the expensive things start breaking down (a new heat pump will run me about $6,000) or re-rent it?

I think debt preferences are completely up to each individual person.

I don't know anything about the listing agent, but the listing broker is a long time local broker, second generation at the ReMax office his Dad started, and was very professional and rapid in his handling of it. 

Instead of giving whole house to single family, I am thinking to give each room to individual on rent.

I look at my monthly statements from my property manager and realize how truly little they make per month off an individual property I wouldn't even drive by for that amount hence the scale needed.

My next thought following would be, transferring money from an account held under the LLC to the mortgage held personally, is that like transferring money between two individuals?

These are definitely lower-income individuals, so I understand that the options are very limited. 

Here is a link for some more info on generating leads and blogging about real estate.