This way you will know if the condo would be profitable/ worth keeping as a rental after you plan to move out and convert to rental. if you do this after, you risk having a condo with negative cashflow.Use rentometer.com to get ballpark rent estimates for a unit in your neighborhood.

When I was an undergrad, I had a statistics teacher who didn't allow calculators!

There is nothing keeping this buyer from RUNNING away from the property, in fact they have 100k in negative equity to motivate them to do exactly that!

I definitely don't want to invest in anything that has flat or negative cashflow after expenses.

Your example as-is creates negative cash flow.For beginning investors, it's extremely important to look for positive net cash flow.

Here is a low-down on what is going on in Wake county. https://www.biggerpockets.com/forums/51/topics/166945-statistics-on-sdira-lending-and-owning-one-county-in-ncPM me for the custodian I used, if you want a name.

In my accounting books, should I classify this "deferred maintenance" as a "repair" (and factor that into my repair budget), or consider it simply as a cost of buying the house (affecting cash-on-cash and cap rate statistics)?

It shows trends and statistics about the accepted price vs list.

If she is negatively impacting others I would probably take some sort of action.

The room was still packed, even with 17 no shows.To your real question, may I suggest that those engaged in legitimate seller financing consider how complying with all the new rules are negatively impacting their businesses.