List price doesn't always reflect market value. Depending on the circumstances, the list price may be set artificially low to entice buyers.
On the other side of that is that the sellers are unrealistic about the value of their property and list higher than market value.
Your own research, coupled with in-depth research by your realtor will lead you to make an informed decision.
Asking on this forum how much you should offer, without any of us having any details about where this property is, what if offers and what the comps look like, what type of sale it is (short sale? bank-owned? regular sale?) will not lead to any other sane recommendation other than: consult your realtor. If you don't have one yet, then you should engage one to help you.
Wishing you good luck and good fortune.