Because of the nature of a tax lien, it would be difficult to obtain financing from a commercial lender secured by the tax lien itself.  

Any advice on what setup is easiest and most tax advantaged?

After that is done, head over to IRS.gov and apply for your EIN (Tax ID).

There is a pretty decently sized parking lot literally less than 100 feet from that house.I am assuming it is part of the college and it is pretty far from the buildings so maybe you could get them to allow you to use it for wedding parking.

State tax regulations are typically able to be researched by any CPA worth his/her salt. 

Is it allowed to purchase a property with our primary home that has a detached ADU on the same tax lot.

Investors get stuck and cannot cash out because of tax complications.

Or building out systems like CRMs.

As long as you filed joint taxes you would be fine.)

I want to find something local (Los Angeles area), move in, do small renovations to possibly build up more equity, do a 1031 exchange, and find something better.