@Aaron FrancesIf you're looking for landlord lease forms, you can download them here https://www.biggerpockets.com/landlord-formsFor the fileplace, you can access it here https://www.biggerpockets.com/files

Usually best to settle or they file BK and landlord gets very little to nothing.Have in lease they have do disclose sales quarterly.

Would not Filing be the best LONG TERM play?

Find out somehow where their new address is (not sure how to find this out affordably), and file a lawsuit against them in small claims court and hope they pay or eventually get their wages garnished.2.)

Everyone makes mistakes now and again when filing a tax return whether it be forgetting a deduction, missing a portion of your income, or improperly depreciating an asset.

In Texas, if a tenant makes a partial payment, you cannot file for eviction.

Plus, aide in your attorney getting motions and ensuant case filed ASAP! 

I finally received a demand letter from a "nonprofit attorney" representing the tenant, claiming that the tenant was living in uninhabitable conditions—typical for a non-paying tenant, I guess—and now she wants to "renegotiate" the rent and keep living in the same space.She has been filing complaints with various government departments, but all the cases were minor and have been closed.

If he vandalized the place file a police report.  

Do you file jointly with someone who has income that needs to be sheltered with RE losses?