I’ve seen parts of this question answered, in previous threads, but looking for a more comprehensive answer/advice.Quick background, I currently work a W2 job, have my real estate license and practice general brokerage on the side, and will be using some excess cash I’ve been able to save to invest in small multifamily (1-4 units) real estate.Aside from those factors and getting to my question, I have a 401K from a previous employer, pension from that employer, and small personal IRA (Traditional) which I would like to rollover into a SD IRA or Solo 401K (if I qualify) to passively invest in MF Syndications.Total rollover would be approximately $70K.What would be the best way to do this, SD IRA vs.

Unfortunately, you cannot rollover a current Roth IRA into a 401(k) plan. 

@Brian EastmanAbout $10k in the Roth IRA and another $6k in a 457b from my last employer (which I think I can roll over into a Roth if i pay taxes on it?).

You can do the contribution / rollover / conversion part - but not the withdrawal part.

For most utilities, you can have the billing roll over to your account when a tenant terminates service. 

I was ready to roll over some of my 401K into a self directed IRA.

Some specifically limit/prohibit roll over/cash out until employment ceases.  

I don't know how well it would work for buy/hold investor.One lender required me to roll over my old mortgage, and would base the HELOC on the new sum...

It's not a crisis situation since their budget can handle the amortization but it would be better to pay down the LOC and have some extra liquidity to rollover into SFR eventually.

Or if leases use this to protect property from erosion, or if tenant killed from ATV accident, would the homeowner be sued because driveway too steep and contributed to rollover etc., or should I add into lease that landlord NOT responsible for any injuries/death with ATV on property?