You have to prove it wasn't done illegally, And, if you can't pay it off to solve the problem, and at the same time, pay for an attorney, you've already lost. 

15 year fixed mortgages are very underrated a 200bps spread is enticing as well as lower transaction costs.  

Government actions are THE cause of the dysfunction in the real estate market and why so few investors and homeowners are transacting.

I agree that DealCheck (or the BP calculator) does not provide enough tools or functionality to analyze those types of transactions (yet).But I would argue that it does a great job at analyzing more traditional buy & hold SFRs and multi-families, as well as flips and rehab projects. 

Mistakes and miscommunication cost people money.I did ask him to explain his transaction,  not an uncommon request, but he has failed to answer it."

I don't see any reason why a legimate, arms-length transaction could not be done.4.

These accountants believe that purchasing from a related party is fine as long as it is an arms- length documented market-consistent transaction.   

To maximize the number of transactions you’re involved in you will need to:Be Top of Mind when they think about moving - which requires consistent reminders.Be seen as an Expert – which requires a consistent message and Evidence of Success storiesGain their Trust – which requires communicating integritySo, start out by listing everyone you know in an Excel spreadsheet.

Working with a CPA experienced in real estate transactions is essential here.If I were you, I’d call some attorneys on Monday if this is something you’d like to move quickly on. 

Maybe if you are doing several transactions a month they would look at it.