I would connect with an attorney immediately so you are going through the proper steps to get the unit producing again.

Each letter is professionaly written with proper salutation, etc.While direct mail works, it is probably the most-expensive advertising and not very efficient.

Specifically what type of permits and zoning I may need or steps I need to take in order to do this properly.

I would use the legal hotline thats available to you as member and get the proper legal advice.

If done properly, short-term rentals can offset directly against ordinary (W2, active) income without the real estate professional status.Losses generated by increasing depreciation with a cost segregation study, can be used to offset active business income without qualifying as a real estate professional.

If we end up in court will the judge see that this is in fact a "Just Cause" eviction based upon our correspondence and evidence and that I simply made a procedural error in not submitting the proper notice?

Be sure to screen properly and use this as a lesson to improve your systems.

Check out proper, foremost, or cbiz.

@Curt Treece that only leads to over-leveraging and the income not properly supporting the debt load

A proper modern Crawlspace has >= 24” clearance thus all sewer lines are easily accessible.