Short version is that the create a c-Corp with a profit sharing plan, you rollover your 401k into that plan and the only investment is to purchase all of the c-Corp stock.

However, I'm looking a bit ahead when I will have access to rollover IRA assets that might be employed in a passive income scenario while also providing overall diversity to my entire retirement program. 

You may be able to rollover the loan from the current plan to a new plan, depending on the current administrator.  

@George TorresIf you're trying to turn the the flipping of in real estate into your full-time job or one of your main jobs, then look into the ROBS 401k (Rollover as Business Startup) as it will allow you to use all of your retirement funds tax and penalty free to finance a real estate operating company provide a you are an employee of the business and therefore you can draw a fair salary. 

As long as you buy another property that is worth more than the one you are selling you can roll over all the proceeds into another property.  

I currently have some money in an old 401K and a traditional IRA that I would like to roll over into a SDIRA.

If it is with a current employer, then borrowing from the 401k is likely the only option as most companies do not allow for an in-service rollover.

@Kenneth Shultz,I *think*, but will let the experts chime in here, that you CAN roll over funds from a regular IRA into a Solo 401K.

Hello BP!

Just looking for some opinions/advise! I will have approx 380 to buy with a property I'm selling(165 equity). The current property doesn't cash flow, but the appreciation has been great! About me...I'm an...

Your exiting IRA funds would be processed as a direct rollover to a new 401k sponsored by your new C-Corporation real-estate operating company.