Even though my income is 100% commission and 100% derived from the business that I generate I cannot write off anything. 

I certify that I do not intend to, and will not, use any list of names or addresses contained in or derived from public records for the purpose of selling or offering for sale any property or service to any person listed or to any person who resides at any address listed..."

Always look what successful people are doing and more importantly what they are NOT doing.. and then... no.. do not copy... but extract the characteristics, commonalities, of their behavior, and derive that equation/formula for success.I do this always.

Because one of the pillars of the “Howey test” is that the profit derived comes from the “efforts of others.”

The asset would need to outperform this one index (an average that has been derived from many previous successful flips in a given market).

I even made my own calculator in excel to derive the cash on cash return.

Derive your cash on cash return and so on.

We derive no comfort because important people, vocal people, or great numbers of people agree with us.

Your value is not derived as much from what other properties nearby are selling for like SFH, but much more on how much income you generate and how well you can operate the property.

You and your Solo 401(k) are distinct taxpayers in the eyes of the IRS,Trump tax reform has precluded the "netting" of income/loss from separate business activities that are subject to UBIT.If your objective relates to #3 (above), there would be benefit derived from a cost seg study - assuming the Mobile Home Park investment is truly subject to UBIT.