Then ask your buyer agent send the CMA analysis to the buyer agent and let see what the seller will response. You can't offer the zillow's price which is over estimated. Since Dec, most places have around 2% price increasing. What about the CMA price: heated area* $/sqft*1.02? If the seller's price is still higher than this price, move to next one.If you are buying the high end house, no hurry and the seller will decrease the price to the market one.good luck.