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

But after 50 years in the trenches and owning a HML company for many years I do have more than a passing knowledge on a lot of real estate techniques..

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

That seems needlessly complicated.

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!

J, came across this post from last year and for the first time I am running into a project that significantly overlaps tax years.I use your CoA for Quickbooks and your general Cogs accounting technique.  

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