Quote from @Scott Meech: Do you the mechanics of having an MTR?

I get the emphasis on tax savings, but I'd be wary of investing for the sake of it.

It is a mechanism towards retirement. 

Just to add ,  not every inspection covers a visual of the septic tank . if they run the water and all mechanicals, they are working fine . other than a visual there are no signs of it not working . 

This is because it was poorly converted, improperly done, "patched up" over time, and might have mixed up mechanicals etc.

But if you're disciplined in money management, which is what they don't really put an emphasis on, then it might just work.  

If they aren't actually filed, there is no way to recoup money through the normal mechanisms. 

Her tenant payment comes from a government entity and is $2100 per month. the house was also recently renovated so all the mechanicals are in good shape. 

How old are the mechanicals? 

I often find that, when talking about future possibilities, and the mechanics of behavior and the economy, often end with with an open ended conversation.