As a rule of thumb, knocking 5% off the list price won’t ruffle any feathers. If it’s been sitting on the market for months, you can venture below that, but the bottom line is, “You never know how low a seller will go, as they have different motivations for selling,” says Marc Castillo of Coldwell Banker in Atlanta, GA.  If the sellers are eager to move, you could luck out and score a deal.