Had structural issues (wall caving in) that I addressed a couple years ago.

Clay soils mean that drainage is really important to prevent foundation issues.

See the old mom-and-pop investors in their sixties that you are trying to buy off-market properties from.This is like people who buy for cash flow but don't realize that with the best cash flow comes capital expenditures and tenant issues.

Under $100k, were talking Old, beat up, it's coming with issues and the vast majority of time there is hidden uglies that come out later. 

Not that I plan to live in or even visit the US anytime soon, but I don't want to deal with winter-related issues like heating, de-winterizing a home etc. 

A "non-refundable deposit" is legally confusing.If they do request a showing, I send them this email:Hi John,Please read this entire email.How about a viewing on X at X pm?

.- The TL states that those are technically the team's leads and I will owe the 20% if they convert within the year since I was given training (which I was not), lender referal (which was forced on me by the TL even though I work with my own lenders for my clients).Is the above statement true/legal/valid?

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

Your main concern should be whether these bedrooms and bathrooms on the lower level are legal and have the proper egress require for fire code and livability.

The reality is there are many issues with ADUs as an investments and the poor valuation is just one of them.