If your agent carefully followed time lines and contract wa extended two years due to seller's lien they owe you.We don't know what state this is, what your contract and amendments say, and if they actually tried to prove the lien was paid.

Since you are doing a new lease or an amendment to the existing one for the rent to increase to $600, if I were in your shoes, I would just make the rent $600 and state that they are to pay $599 to my account and they are to pay the $1 fee to the App totaling $600. 

You will need both people to sign an amendment removing him from the lease. 

Perhaps you could amend your tax return later to get back the deductions, but talk to your CPA about anything you do regarding your taxes.It’s hard to offer a suggestion without knowing more particulars.  

Allow her to email you her stories and fabrications, have a little disclosure on your amended contract that you record discussions, emails, conversations and so forth.Monthly inspections.

During due diligence:  get copies of current leases, lease amendments,       exhibits, rent receipt details (proof of tenant's paying timely), deposits       held, etc. 

If it doesn't, I just put it on the list for future amendments. 

I would amend the lease giving them October free (see why I don't do this?)

Lease Amendment 4.

Initially submitted as a request to convert to a triplex but amended to be a duplex due to costly building code requirements in our locale.Site plan waiver DENIED 7/29.