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And where should the appeal be sent to? According to the rules, appeals must be mailed in triplicate... three copies one each sent to the Hudson County Board of Taxation in Jersey City, your city's Assessor, and the City Clerk. Make sure the form is the original from City Hall, or an authorized one from the county board's website.
How do you actually go about the property appeal? You can read the details in my +Yahoo! Finance article, First Person: How I Reduced My Property Tax Bill by 25%
If you are looking for MLS listings from many months ago, I find Streeteasy is the best source of getting those old sales details.
Good luck!
Image: http://www.sxc.hu/browse.phtml?f=download&id=1139531