Enforcing the termination of a lease due to non-compliance (unauthorized resident) is not the same as ending a month to month lease. 

$500 per day penalty up to $10,000 and up to 2 years in prison for willful evasion per entityNo cap on the amount of entity penaltiesCheck with your CPA, Tax Advisor or attorney on this as it is a freight train of compliance coming!

I cannot speak to the IRS compliance as I am not a CPA but I am happy to share some of what they do, as well as assist in any management and/or acquisition questions. 

Prepayment penalties are a thing of the past, so dump your bitcoin into paying down the balance (and, possibly, dropping the PMI) after the fact - no one sources where you make your normal monthly mortgage payments from.It's going to be in limbo and a giant "it depends" until such time as someone opens a Bitcoin clearing house that does all the little compliance and PATRIOT Act things that Wells Fargo and Fidelity do, or (more likely) until such time as Fidelity or Wells Fargo adds Bitcoin to their financial service offerings. 

Indeed, to stay in compliance with fair housing, you need to treat each tenant the same, so that's something to keep in mind. 

If can't transfer the rental into LLC and there are compliance costs associated with maintaining it you might consider shutting it down.

Consult with a tax advisor or attorney familiar with both partnership law and real estate to ensure compliance and minimize tax liability.Once under a TIC structure, 1031 exchanges for individual members could allow them to reinvest proceeds from the sale of properties into new ones without triggering immediate capital gains taxes.

Compliance costs can really make it though for a startup if you don't intent to explode.

Whether it's a legal demand for compliance or simply an email, it doesn't really matter; just make sure everything is in writing. 

Notwithstanding, "plan provider" connotes a service that is primarily focused on 401k document provision and compliance support and "plan administrator" connotes a more involved level of support in management of the plan.