@Jun Lee Solo 401k is a great vehicle for investing!  

Looking at the long-term picture I just alluded to though, that wouldn't be my preferred investment vehicle.

It's not just any kind of car, and even if you buy the "right" vehicle, it has to be used 100% for business, which is rare.

It is our goal to deliver all of this in the RTR Academy along with a plethora of benefits to students to include:-VIP access to RTR inventory before the general public-ability to earn back course fees through investing & our attractive referral program-tax, legal & investing advice from our team of attorney, CPAs & investment advisors-no cost SDIRA or solo 401(k) account to invest through retirement vehicles -lifetime membership with no ongoing or additional fees, etc.!

In a rapidly-rising interest rate environment (such as we've recently experienced) that tradeoff may or may not pay off.Unfortunately, in CRE finance there is no perfect financing vehicle and you can't eliminate risk--you must choose which risk you want.

No reason to involve a second debt vehicle. 

LLC is a tax vehicle Not an asset protection vehicle for single members and or family type lLCs at least from what I see.

Love that you are learning more about the investment vehicle and that you are moving onto step two where you are working your investment criteria as well as networking with sponsors alike.

Finance was a combination of a few different vehicles and ultimately ended with a HELOC which was then used to fund multiple other projects over the years.

One was even about vehicles and not real estate.