Think of the SDIRA as a separate entity/corporate /owner.

Ask the attorney who sets up the LLC for you, how successful they are for example breaking the corporate veil? 

At this moment, we are now invested in 26 apartments across the US, replaced two six-figure incomes, and have retired from corporate America much earlier than we thought we could ever do.Lifestyles Unlimited has been around for 32 years and has over 50K members.

Of course, normal piercing of the corporate veil analysis applies and you can botch it up by mixing personal and company transactions or by failing to follow legal formalities for the LLC.

There is also one big issue with your tax projection - the taxes of $280 are based on the vacant land taxes and will likely go up to ~$2000-$3000 in a year or so when the assessor catches up with you.I realize there is a 1031 involved so a real estate purchase is necessary, but you should compare your ROI to a safe yielding instrument like a 10 year T-note or AAA corporate bond yield. 

It just looks like another corporate guru trying to win your business.

If something really bad happens,  the lawyers would "Pierce the corporate veil" of those LLC's to get to your assets anyway. 

The only reason I'm hesitant to move forward without this info is that the seller is an inactive corporation - if they dissolve and there are issues with their warranty deed then I don't want to have to pay a lawyer to go after the GP of the defunct partnership to make me whole.

This means that you will probably need to pay registration and filing fees in at least 2 states if you don’t buy CA property as a CA resident.Any lawsuits should be limited to the assets of the LLC and not your personal assets (assuming you run the LLC appropriately and the corporate veil is not pierced, some debate as to SMLLC).

If this is a large corporation it may make a difference, or if the landlord was that bad and a point needs to be made, then maybe.