If I thought for one minute it was a money maker or sustainable I would not have sold my 200 doors. 

Focus is on the property’s ability to cover debt and ensure financial sustainability over the loan term.

If your rent is always paid before the 10th over a sustained period of time you are winning. 

Get 3 estimates, some times they will only  replace to the point of proper old sewer line only that can save money  BIG time   .They will add a clean out  next to the house one out farther where they stopped the new sewer line  replacement .As far as suing  any one on such a manner need to figure out what the legal  cost are plus what  percent chance of success then decide  of you want to roll the dice  unfortunately this type of scam happens a lot now a days .

Gently let them know that if they continue to use the HVAC in this manner and it causes the unit to fail, they will be responsible for replacing it due to negligence. 

I was a Top Producer user for years and finally quit when it wouldn’t update anything in a timely manner.

They caught folks on the run up, but believed it was sustainable probably themselves.

The FHA self-sustainability rule was only introduced in March of 2023 at the lobbying of a lot of larger landlords and property buyers. 

@Michael MingI will preface this with I don’t have any direct experience to offer you… but my guess is that if you are talking about the IRS, there would not be a lien placed on anything in any sort of quick manner.  

@Brian Ploszay definitely had some great insight.To expand on his first point, I think a "triple net lease" would be a good model to try to follow.Also, make sure that in the event your optimal tenant (drug rehab) were to move out, you have multiple exits to help you sustain any market downturn.