I would contact a local real estate professional to help with this answer and to save time and money.
(Not me, I'm on the Cape, but I can help you choose a local pro if you want help doing so.)
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.)
if you are looking for a more accurate estimate than what you find in sites like this you need to get your buyers' agent (assuming you are a buyer here) to do a CMA. This property already has an offer on it, maybe yours?, but they are taking back up offers. email@example.com