Best area for infill or knock down/ new build in Georgia?

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I'm looking for areas in Georgia to target for direct mail campaigns. I've heard that some of the largest profits a wholesaler can earn are from finding properties that home builders will want so they can knock the old house down and build a new one. I believe this is called infill. You find older, smaller homes in an area with bigger, more expensive homes. I think the Decatur area, especially around Emory, is a good place to target. Any suggestions for other areas that Georgia home builders are looking for these days?