Never base any pricing decisions on Zillow's Zestimates. I am a Certified Residential Real Estate Appraiser as well as a real estate agent. I have personally appraised over 1,500 properties in Massachusetts. DO NOT rely on Zestimates for accurate market values. They are notoriously off target. It is impossible for a computer algorithm to accurately take into account all the intricacies of a particular market. Zestimates should come with a disclaimer "For Entertainment Purposes Only" because I agree, they are fun to check out. Consult with a local real estate agent, or better yet a local real estate appraiser, if you are interested in determining a TRUE market value. ESPECIALLY if you are considering buying this property!
Hope this help.