Purchase Property through Tax lien

[Pamela Holmes]

My deal:

"The owner of a 4/1 home is 2 years behind on his property tax and can't afford to pay it. I offered to write up a contract where I will pay the taxes owed and set up a payment plan with the owner. If he is in default of the agreed upon terms, then I will gain title to his property."

What is the best way to structure this deal? What documents are required to finalize this deal?