I'm surprised to see you're a moderator because it seems you lack some reading comprehension.

It is important to check with your state’s regulatory authority to understand the specific requirements.2.

However, if I advertised a property for sale that I did not own this would not prevent a disgruntled Realtor from turning me into the authorities.

Having engineering plans and calculations can streamline the permitting process, as many local authorities require this documentation for ADU conversions.I can't give an invoice estimate as I am not well versed in how engineers price their work, but I would assume something around $5,000 for engineering services on a project of this size.

The fundamental failure in comprehension you have John is your ASSUMING that seller would want/demand to readily provide access for any/all random persons of inquiry. 

Perhaps you can call the local housing authority for some direction as they too would want you to do things appropriately.Can you ask the sellers to get them out before closing?

I use Proper Insurance, which is generally regarded as having the most comprehensive coverage, but is also higher priced than some.

It can notify hosts when supplies are running low and help keep track of usage over time.Hostfully: Hostfully provides a comprehensive platform for managing vacation rentals, including inventory tracking.

They said if I show there place for future renters they will get authorities involved.

Similarly, make sure all of these transaction participants maintain adequate insurance and list you, the property owner and any intermediary as additional insured.If you rely on an intermediary relationship (most commonly a General Contractor or Property Manager), understand the authority granted in any agreement you execute to act on your behalf.Review the indemnification provisions in any service agreement ensuring the standard of care will not preclude insurance coverage and the provision is equitable.To recap, it’s not necessary to form a land trust, separate management LLC’s or form entities in specific states believing you will hide in the cloaks of secrecy.