@Colt ClarkWhere do you plan on hanging your license?

As a last resort You could hang a ceiling below your existing ceding on resilient channels to help reduce sound transfer

Or if the agency gets through they can hang up, make promises they are not going to keep. 

I don't want my letter to hang out with the dozen newspapers on the porch, if you get my drift.What do you guys do to find owners of homes like this?

We've had this kind of problem before, and honestly, it seems to just gradually get worse and worse until we can get the tenant out.You can schedule frequent inspections to get inside the house and check the condition and count beds and toothbrushes.You can give your business card to all the neighbors and see if any of them are willing to have a camera to record the house set up temporarily.You can hang back and wait for it to play out.You can stop by the police department and see what they are willing to share and if they have a program where you can copies of all calls to the property.You can send a cease and desist letter stating that if you get any proof of criminal activity or extra occupants there will be no leniency.  

Does anyone have suggestions of a broker that allowed them to hang their license for a nominal fee?

In my opinion, you'll want to get the hang of managing one and then find ways to manage more.  

Now, Lowes stores seem understaffed with employees trying to hang out "in the back" and away from customers, if they can help it.  

As a reminder, he has the legal entity set up so my girlfriend can 'hang' her license up there and will be its corporate broker.

Try and get the hang of things.