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

@Chris CarreathersWelcome and there are extensive pieces of information on wholesaling on BP to help you, as well as investor groups to attend here.Also, I believe you meant to say 'cost prohibitive'.

@Dan KrupaFollowing are the similarities and differences between the solo 401k and the self-directed IRA.The Self-Directed IRA and Solo 401k Similarities Both were created by congress for individuals to save for retirement;Both may be invested in alternative investments such as real estate, precious metals tax liens, promissory notes, private company shares, and stocks and mutual funds, to name a few;Both allow for Roth contributions;Both are subject to prohibited transaction rules;Both are subject to federal taxes at time of distribution;Both allow for checkbook control for placing alternative investments;Both may be invested in annuities;Both are protected from creditors;Both allow for nondeductible contributions;Both are prohibited from investing in assets listed under I.R.C. 408(m); andThe Self-Directed IRA and Solo 401k DifferencesIn order to open a solo 401k, self-employment, whether on a part-time or full-time basis, is required;To open a self-directed IRA, self-employment income is not required;In order to gain IRA checkbook control over the self-directed IRA funds, a limited liability company (IRA LLC) must be utilized;The solo 401k allows for checkbook control from the onset;The solo 401k allows for personal loan known as a solo 401k loan;It is prohibited to borrow from your IRA;The Solo 401k may be invested in life insurance;The self-directed IRA may not be invested in life insurance;The solo 401k allow for high contribution amounts (for 2016; the solo 401k contribution limit is $53,000, whereas the self-directed IRA contribution limit is $5,500);The solo 401k business owner can serve as trustee of the solo 401k;The self-directed IRA participant/owner may not serve as trustee or custodian of her IRA; instead, a trust company or bank institution is required;When distributions commence from the solo 401k a mandatory 20% of federal taxes must be withheld from each distribution and submitted electronically to the IRS by the 15th of the month following the date of each distribution;Rollovers and/or transfers from IRAs or qualified plans (e.g., former employer 401k) to a solo 401k are not reported on Form 5498, but rather on Form 5500-EZ, but only if the air market value of the solo 401k exceeds $250K as of the end of the plan year (generally 12/31);When funds are rolled over or transferred from an IRA or 401k to a self-directed IRA, the amount deposited into the self-directed IRA is reported on Form 5498 by the receiving self-directed IRA custodian by May of the year following the rollover/transfer.Rollovers (provided the 60 day rollover window is satisfied) from an IRA to a Solo 401k or self-directed IRA are reported on lines 15a and 15b of Form 1040;Pre-tax IRA contributions on reported on line 32 of Form 1040;Pre-tax solo 401k contributions are reported on line 28 of Form 1040;Roth solo 401k funds are subject to RMDs;A Roth 401k may be transferred to a Roth IRA (Note that from a planning perspective, it may be advantageous to transfer Roth Solo 401k funds to a Roth IRA before turning age 70 ½ in order to escape the Roth RMD requirement applicable to Roth 401k contributions including Roth Solo 401k contributions and earnings.)

I don't believe a pure fee, arranged outside of a transaction, would be prohibited, if you're just marketing and giving somebody a "heads-up."

Rent backs and buy backs are generally prohibited.

I was going by the 87.5 percent rule The average home buyer cannot buy the 1588 sq ft condos downtown  for $675,000  I'm two miles from downtown 1/4 mile from Canada  There is still excellent opportunity as the prohibitive prices expand into adjacent neighborhoods.Dan Gilbert (Quicken Loans) owns more than 100 buildings downtown and is currently building 4 more 1 is costing him around $800,000,000.00 for the one building Hudson's Department Store Site It was supposed to be the 23rd tallest building in the US but it got shorter with his massive stroke and Covid 19There are areas that I think will come back faster than my area did ( buy for $10k put $20k into it worth $150-$200k in three years) The only point I was making was I NEVER understood why people cited Detroit as an example of good cash flow but no appreciation.The appreciation has been unbeatable.

The prohibitions specifically cover discrimination because of race, color, national origin, religion, sex, disability and the presence of children.

@Jay Hinrichs suggests the 3 C'sCollateralCharacter of the borrowerCapacity to repay.If you feel they meet these qualifications and your state does not prohibit the loan, then maybe.

I am a carpenter and could do most of the work myself but in an SDIRA thats prohibited so just trying to find the right solution for me.

As for smoking, I don't allow it with my tenants and my lease prohibits it.