They have been there 5 months of the 12 month lease.   

He let someone he trusted move in next door without a lease as that person does work around the property for him, and that person let someone else come in and had a quickly broken relationship with second person, and that second person let a third person come in with a new relationship with second person.

We are also having problems with our current tenants and recently gave them 60 day's notice to vacate (the lease expired and they are now month to month).

@Amy Kendall We have mainly done lease-purchase and owner finance, but the numbers on STRs definitely caught my attention, so we're exploring that now.We like Cobb for the low taxes, but we're invested in Gwinnett, Fulton, DeKalb, and other Metro Atlanta counties as well.

Here’s what I put in the lease about it.BASEMENT: The basement of the home will be locked for the duration of the lease.

She’s asking if she can sub lease her room (rent it out to someone she knows or finds) for the remainder of the lease.

Review their lease agreement and addendums.

One of the tenants is a problem tenant, and on on government assistance. recently she got in an altercation with one of the other tenants causing them to break their lease and moved out.

So, we are wanting to take the step of spending the money to get a solid lease in place.

After sending the script above and explaining that anyone on the lease must reside in the unit, I would leave it at that and not entertain any further dialogue.