But as Patsy mentioned, you might have a harder time with a lender providing this loan since you have a non-equity party providing part of the down payment.

***Additionally, a mortgage broker that is able to take a tenant-buyer's option consideration that is paid to me (wholesale lease option deal), and either apply that consideration towards the TB's down payment when the exercise their right to purchase ORdiscount the price of the house.Typically the consideration goes through a third-party escrow account (my attorney's), and that helps with the above.Typically mortgage brokers who understand this type of situation will only submit financing applications to banks they have great relationships and won't have an issue with this type of thing.Thanks in advance!!

At least have a 3rd party licensed agent do a BPO / CMA price for this property.  

Most of them are able to remotely purchase based off of referrals, numbers, photos, videos, 3rd party inspections and whatever else they need to feel comfortable.

The refinancing part is traditionally done with a bank. 

The LLC that you own is a disqualified party, so it would be a prohibited transaction between the Solo 401k and that LLC. 

To this date, the owner on the property record still shows "SECRETARY OF DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT" as the owner even though the party I'm buying it from is Wells Fargo Bank.

Your best solution is to scrap the trust and the third party trustee.

I am late to the party here but you made the right choice, you were paying retail on this one. 

Your professional education requires effort and a maturity level beyond the level of college students attending frat parties or youthful happy go lucky work ethics.