@Scott Jensen Thanks for your response!
That’s a solid idea on a management company to qualify for the solo 401k.
I know it's not the best idea to mix retirement funds with REI, especially for someone just starting out. Mainly, I was hoping to use the money I already have in my 401k for either a down payment on my first property, or set myself up as a hard money lender. I'm not sure if either of those are sound strategies. I could probably just open a line of credit with a bank for the down payment for my first property, I just thought it would make more sense to pay myself the interest instead of the bank.
To be clear, it was not my intend to buy rental properties with retirement money. I wanted to take a loan out on my 401k to fund the down payment for a rental property. I was also looking at selecting something different (not rentals) to invest my retirement account into besides stocks, bonds, and mutual funds.