I definitely would want the mail to go to the correct place.If someone wanted to sue you, the fact that you ignored changing your address would be a good argument that you are not maintaining corporate formalities, potentially having the protections of your LLC ignored.Most states have annual filing requirements for the LLCs so that would be a good time to update it.  

Consider if it will truly benefit your tax position, liability protection, or asset management, or if it will just add unnecessary paperwork.If you’re in a state like California, keep in mind that you’ll have to pay $800 annually to the Franchise Tax Board, file a periodic Statement of Information (SOI), and submit a Beneficial Ownership Information (BOI) report.It’s a good idea to consult a real estate attorney to ensure you’re making the best decision for your specific needs.

I'm looking for ways I can "protect" this private lender. 

While the landlord defined the dwelling unit as his single-family home; the court, after analyzing the statutory definitions of the term, the determined that the dwelling unit at issue was the separate room being rented to the tenant.[2] As a result, the landlord had converted his single unit dwelling into a multi-unit dwelling that was subject to Oakland’s Rent Adjustment Program since the individual rooms were not alienable separate from the title to any other dwelling unit.Under the court’s decision, tenants in Oakland renting rooms in a single-family home or a condominium are entitled to the protections provided by Oakland’s Rent Adjustment Program.

Tenants wont be hard to find like you mentioned but mindfulness on the protection laws in the process will be important.

This protects you in case the buyer defaults.Lastly, keep in mind that owner financing comes with some risk.

Is it common to protect your list or are you open to sharing with fellow investors your know?

Vance, elaborated on the idea, with Vance advocating the development of non-protected federal lands for housing.

I enjoy your perspective and purpose-driven attitude, there is no substitute for hard work over an extended period of time.As relates to this topic, protecting my guys (many of them pro athletes) is important to me. 

This structure can provide liability protection and potential tax benefits.Consult with a Lawyer: A real estate attorney can help you form the entity and ensure it's set up correctly for property ownership and management.2.