He has no intention on paying any money back and will change his number after the deposit is made.

And that you handle like you would anybody else - bank statements, extra deposits if you're concerned etc.

Will he be getting his security deposit back?

Some say the deposit, which I don't understand and others say off the payments.

I would offer an incentive for signing a longer term lease- $50 less a month than your new month to month price maybe.At closing, make sure they transfer the security deposit and prorated rent for whatever was collected that month.Kelly

Can a Security Deposit Be Used For Unpaid Rent in Chicago?

Have them deposit in a bank account.Have them mail to you.

I have had tens of thousands of dollars of damage caused by 'good dogs' and "wonderful, loving" cats-some so severe that it was almost better off to demolish the property.Even if I accepted a substantial ( and by substantial, I mean $10k or more) pet deposit  I still run the risk of exceeding that if enough damage is done. 

Also, do I have to keep tenant security deposits and last month's rent in a separate trust account?

The deputy has been depositing the money into his personal checking account to take $50 out for himself for managing the property and sending the remainder the owner out of state.