In answer to your questions:
1- The $30,000 buys the house complete, including escrow fees . Out the door.
2- You are not mutual or partners with anyone. You get the “pink slip” to your property.
3- The properties are all single family homes.
4- How long are you expected to commit? The day after you buy it you can do with it what you please. Again, you are the owner and can rent it or re-sell it. In my mind there are at least 3 good exit strategies, but probably many more.
I hope this helps.