I have been charged twice for the same repair, had repairs done that I did not authorize, had them fail to actually do repairs I did authorize in a timely manner and then blame me for it, had people just forget to respond to me, all kinds of problems.

You should never let someone into a unit without written evidence that you have authorization to do so from the lessee. 

They cannot continue a lawsuit on your behalf if you have not authorized it.I would send them a short demand:"You have five business days to stop the lawsuit and turn over all documents, funds, and anything else pertaining to my property.

Battery Park City Exchange (New York City): The city of New York engaged in a land swap with the Battery Park City Authority, allowing for the creation of a new public school and affordable housing units in exchange for a parcel of land that was then developed into a high-value commercial property. 5.

Signing the lease demonstrates they agree to the terms and then you can hold them accountable.If you don't do this, then the person named on the lease and paying the rent could disappear and you would have no legal authority to charge the remaining three for unpaid rent.

My goal is to use bitcoin as DOWNPAYMENT which I have not found a bank to do that.To answer your second question bitcoin is the first currency that does not require a central authority to keep everyone’s balance and insure funds are not double spent.

I'm a newbie tooSelf education through books is a conversation between the author (mentor) and you.You'll gain knowledge, connections etc but it takes timeAttending meetups, listening to Youtube videos on subject matter further broadens knowledge base

Are you aware of some actual legal authority that validates the IRS opinion on this issue?

The tourism authority has had some good information in the past about how many visitors come to each island and, of those visitors, how many book STRs.

I think those are much more productive for the person asking for help than back and forth essay length messages.