The biggest benefit I think is that cash allows you to offer on properties that do not qualify for a loan, reducing the buyer pool greatly so normally much better deals available in that category. 

We've been looking out of state a lot as the market here in Utah is crazy but haven't pulled the trigger on anything yet.I recently heard of someone who has been extremely successful in their real estate career who built a new primary residence every 2 years which came with certain tax benefits and profit in an appreciating market.So I thought maybe instead of finding a rental property to buy we could build a new primary residence and rent out our current home which has appreciated about 60% in the 5 years we've owned it.

I like to have control in most situations to ensure the right people are hired and the right solutions are implemented but I can see a benefit to asking the seller to deal with it. 

I look forwarding to meeting you guys and someday forming successful partnerships that we can all benefit from. if you have any advice for someone like me, please feel free to share.

My hope for you is that you gain the knowledge you need to be comfortable and follow your passion.

Each step is not easy for me, however, for the benefit of use the $250,000 LOC over and over, this risk is worth to take, and I need to buy and read more books, and lay out a detailed plan before putting into action.Thanks again,Yuqi

@Adam Harper do you want tax benefits or asset protection?

For some reason, the groups on the Seacoast never seem to gain much traction or stick around.  

Sine we own our primary residence one of the banks we contacted suggested we use a home equity installment loan (HEIL) saying that it would allow us to make what amounts to a cash offer on the property and secure the loan with a similar term and interest rate to a conventional loan and the added benefits of no closing costs.  

The law requires that you also offer retirement benefits to your employees and Solo 401k is not designed for that.As Brian said a self-directed IRA will be your alternative.