A business line of credit through your LLC protects personal assets, builds business credit, and may allow interest deductions, but it might be harder to secure for a new LLC.

You'd have to do the research locally, market by market, to determine who the players are.

Ensure you understand local regulations regarding permits; it’s usually a good idea for your associates to form an LLC for liability protection, but individuals can do renovations as long as they pull the necessary permits.

I've also heard of requirements to own for at least one year before you can use the home as a STR.Hawaii is a leftist state that doesn't protect private property rights.

Another key benefit is diversification; an SDIRA allows you to include real estate in your portfolio, reducing risk by spreading your investments across different asset types, which isn’t possible with a standard IRA.Moreover, assets in an SDIRA often enjoy protection from creditors, adding a layer of security to your investments.

It offers flexibility as a landlord to be able to offer more or less rooms as needed, protection to the landlord in that you can hedge with adding LTR or STR to the mix, and simplification to the business as your only dealing with one address.

To simplify the existing lease I thought about asking the tenant if they would be ok modifying the addendums to get rid of the resident benefit package and the building protection plan. 

The pref layer is a third party institutional player.  

I'm not into Sub2. there is no personal liability protection in a single member LLC.. there is protection if you have unrelated members in your LLC . 

Holding properties in an LLC (or other legal entity) can offer valuable protection for your personal assets, so I understand why you went that route.