Unpaid Rent - Tenant Moved Out

[Michael L.]

Dear Experts,

I had a tenant who was two months behind and under the threat of having an eviction on his record agreed to voluntarily move out and pay the owed amount at a specified later date. I drafted a document using one of the templates online saying that tenant is moving out and landlord is regaining a full possession of the property. We've added a clause with an agreed amount that tenant owes to landlord as a delinquent rent and it is to be paid on or before a certain date. We both signed the document and tenant did move out as per our agreement. 

Now my question is about the money. I tried getting tenant's new address, but he wouldn't give it to me. He doesn't want to communicate and I get an overall feeling that he won't just magically show up with the money to pay as specified in our agreement. What are the ways for me to chase that money past due date? Does the document give me any new options of addressing the collection?

I've already rented the place to new tenants, but would still like to recover at least some of the money.

Really appreciate your advice!