Mike Ferry has a good script for this. The gist of it is:
"I just listed the home at 123 main. Have you talked with anyone who has shown interest in living in your neighborhood?"
-Follow that up with:
"Usually, when a home goes on the market in a n'hood, others do too. Have you thought about putting your home on the market?"
Make it into a conversation, don't just hammer them with questions.
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Greg Sargent
Licensed Georgia Real Estate Broker.