I am guessing only you would be signing the 18 month lease and this individual who is there to "help" won't be voluntarily offering their signature as a co-signer?

Just a different takeNow this is not to sayPS - those houses that were priced way too high and languish?

You need to think of that before it comes up (I know this the hard way...because I forgot).

This month it is this Thursday, February 20 at 6:30p.

Is this a tenant you no longer want because of his filing?  

What made you interested in investing in this type of deal?

Quote from @Anshuman Thakur: Can someone please shed some light on how- convert 401k to SD IRA- how to use SDIRA to buy properties- how much down payment is typically required if we are using SDiRA to only fund downpayment on a multifamily CRE, and which banks typically work with SDIRAs- how does LLC structure- property management and cash flow work in this situation?

How can I structure this deal to protect my interests?

I'm not sure if they still have that in this current rate environment but they do exist. 

You could make this work ST, MT or LT, depending on how you approach it - the key with unique grounds is owner-provided upkeep and service built into the listing and what permits allow.