Cold calling on a neglected property

[Ian Hooper]

I was driving for dollars, and found an unoccupied and untended duplex on otherwise nicely kept street. My research has turned up that the property is owned free and clear by an elderly woman. I have located her son via Facebook, and even have a phone number for him. I have an appointment with one of my mentors/team members who is going to coach me through the call to her son, tomorrow. 

What should I ask her son? If he is receptive to a conversation, what type of questions is likely to ask me. Any and all experience is appreciated, as this is the first time I've used this technique.

Thanks