Getting phone calls. What questions to ask?

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I set up a toll free number and posted it in our local classifieds. So far I've received three calls. They just say they have a property for sale and leave a contact number. When I call back what are the questions I should ask?

Build rapport... find out if they are really motivated. If they are:

Find out the address of property for comps

Find out what existing loans are on the property including monthly payments and interest rates.

If there are any tenants currently living in property.

Any liens against the property.

Is there anything else I should ask?