I a homebuyer and am not working with an agent. I find homes on line & contact the listing agent to arrange viewing. I contacted "Mary" about a 2bdm condo. I told her I was not working with an agent. She arranged for me to see her unit (never met me…she already had the building concierge set up with a key to the unit, and he gave me the key). 2 weeks later, I called Mary to tell her I wanted to take a second look at the unit. she again arranged for the concierge to give me the key. She asked if I was interested in a 3-bdm unit in the same building. I was. She indicated the unit would not be listed for another month. She arranged for the trustee of the estate who was managing the unit, to meet me and show it to me. I ended up loving the unit and I plan to buy it. The trustee indicated that she had no agreement with Mary and was under no-obligation to her. Mary will perform no services of any kind for me. How much (percentage) should I give Mary for telling me about the unit?