When we sell the home, the door will be opened and it can be a functional single family home with a mother-in-law suite.

In Excel, use either a Goal Seek function or a Data Table. 

It's functioning but how concerned should I be?

Anything functional under $1,000 that's a 3 bedroom or more is renting quickly.  

Assistance animals perform many disability-related functions, including but not limited to, guiding individuals who are blind or have low vision, alerting individuals who are deaf or hard of hearing to sounds, providing protection or rescue assistance, pulling a wheelchair, fetching items, alerting persons to impending seizures, or providing emotional support to persons with disabilities who have a disability-related need for such support.

Is this doubling a function that can only happen in the lower end market where the house purchased was barely six figures?  

So, not sure how you'll convince a judge that you aren't functioning like a property management company.The, "all you do is give guests access" argument for not having an agent license, probably won't go over in court well either.So, be careful of the responses of others giving heir opinions or sharing they've been doing fine with no licenses.Just because they haven't been caught, doesn't make it legal.

I just learned how to use the @ function. 

That is, since the principal balance remains high, which is mostly unsecured, and the rates are low, effective yields can still mirror each other as a function of the math.  

You can look about halfway down the home page and there is a search function for finding a member.