How would you structure this lease back / lease purchase option to best protect myself ?

[Westin Hudnall]

Home Value as is $125 K

Purchase Price - $70 k

The owner I would be purchasing it from is losing it to the bank and wants to continue to rent with the option of purchasing the house back in 5 years or less for 90 K.

I have never done a lease back ; what should I put in my lease with the renter to protect myself down the line if she was to struggle with payments ; damage the home ; etc ?

Thank you in advance