This is a complicated situation, but @Roger D Jones gave you some great insight and direction for your specific case.

That seems needlessly complicated.

I think that the last 80 years is maybe a little more complicated than that, yes?

While Solo 401(k)s are still subject to UBIT, the absence of UDFI can simplify tax considerations and reduce potential liabilities.Structuring for Tax and Liability Benefits:While some investors consider setting up an LLC to loan money to a syndication, this approach is often overly complicated and not typically worth the effort, especially from the syndicator's perspective.

The process is a bit more complicated than that.

This is one of those complicated areas of the tax code.

@Jay Cho it's more complicated that you may think.You technically won't own the property!

Don't make it so complicated that you have to spend more time learning the software than it's actually saving you.

(Instead of complicated private money or hard lenders)

Also, I have a month to month tenant in the SF, which could complicate the sale. - Conventional purchase with 20% down using a HELOC: Current cashflow from the SF could cover a big portion of the HELOC payment, but this starts to feel risky from a cashflow and funds available for rehab.- Conventional and move there/rent out my primary: Certainly the best option, but a hard no from my S.O.'