Many personal residence's make terrable rental properties because they were not purchased as rentals.Do the math.

Im sure you already did the math but just thought I'd throw this out there.

Math isn't scary - it either makes sense or it doesn't.  

This got me thinking and I did some math and found if I was a good landlord and kept my vacancies low then the return on the cash I had invested would way outperform any return I have ever made in stocks and IRA etc.

Plus the math wasn't going to work out nicely for you on the roof.  

I am a full time math teacher, own my own lawncare business that I spray about 500 customers lawns.  

While this only takes less than a second in my brain, when I have to do this with every letter in a word and every number it dramatically slows my reading and timed math test.

Changing your example a bit for easier math, let's say you bought a 100K balance note at 80K, so you bought it at 80% of UPB. 

Either he's bad at math, bad at figuring how long it will take to do a job, or bad at communicating with you (either way, not a good businessman).What happened to your "old" carpentry crew?

PLUS , you still cannot show how it is functional in any way since you have to have a SOLD price to do your simplistic math.