Rental income carries the debt service 100% How did you find this deal and how did you negotiate it?

This can not be said about many 100k properties.Turnkey providers made sense IMO back in 2010-2015 when it was easy to find deals, but hard to get funding, so you'd sell the ones you could not get funding for.

I wanted to help them out and minimize their loss and saw an opportunity to get a property slightly below market because of my commission savings, immediate mortgage and maintenance relief, in addition to keeping a lower short term interest rate How did you find this deal and how did you negotiate it?

They used lasers to find the low spots and used "push piers" to lift those areas. 

What neighborhood is this triplex in and di you find the property on MLS or off market? 

It looks good) I stumbled across someone locally who does it, but I'm sure you could find someone there if you or other out-of-town investors like the idea of paying a bit more for that level of security and obtain a remote monitoring source of the exterior of the properties.

But I do not find that much information pertaining to the process in doing so.

Then there’s fraud or misrepresentation, where borrowers inflate project values or provide false documentation.

This tool (no affiliation with BiggerPockets) can help your son find properties with assumable loans. 

Either can work, propstream will be more affordable  but is propstream as good as data tree finding vacant land. i am on propstream looking and cannot seem to find anything decent , and i am looking in areas where i know vacant land is