So probably would be worth engaging a lawyer if you want to legitimize it.  

I would not engage in any back-and-forth discussion.

Our current investment holdings now consist of an inherited condo that made us accidental landlords and at the same time spurred our already investment-curious minds into getting engaged in real estate investment and to that end, a newly purchased 4-unit apartment building - I'll post more about that separately.

Thinking about becoming a lender or engaging in seller finance?

The investment activities you plan to engage in with the Solo 401k do not classify as that self employment.  

Three books that have really helped change my mindset and help keep me actively engaged are "The Miracle Morning" by Hal Elrod, "Atomic Habits" by James Clear and "Finish" by Jon Acuff.

I just started engaging in the community a month ago (after gourging information for about a year) and it has DRASTICALLY changed my perspective about real estate, making me much better at understanding 1) what I want out of R.E. and 2) how to get to my end goal. 

Development Team: What consultants should you engage for the project and at what stage?

But out our way the ONLY time your engaging an attorney is if your in a lawsuit or your buying very expensive 8 figure complicated projects.. if its just rentals no need.. not that complicated .. 

Now me I would have lost half of them in the negotiation stages I simply take it to personally... and this is very true with FSBO.. you need the buyer and seller NEVER to meet or engage they kill move deals than carters got pills