If your offer is close to others and your financial is strong, e.g. downpayment is high, close time is flexible, the sell agent may 告诉我有比我 出价高的问我要不要加价. If other offer is much better than yours, you don't have too much chance. But be careful, once there are multipal offers, it is very possible to become a bidding war, whichis not good to buyers.