If you want to research comparable sale information for a specific property, you would probably be better off using http://www.PropertyShark.com or http://www.Zillow.com. Those web sites can show you recent sale information.
Keep in mind that if you want a more specific and accurate estimate of your property's value, your best bet would be to have a real estate agent or two come by your home, provide you with the most recent and relevant sales comps and give you their opinion of how much your home is worth. It is also a god idea to speak to agent that specialize in your neighborhood and have sold homes in the area.
I have been helping consumers sell homes in Brooklyn since 1993, feel free to contact me as I would love the opportunity to help you. Good luck!
Mitchell S. Feldman
Associate Broker/ Director of Sales
Madison Estates & Properties, Inc.
Office: (718) 645-1665/ Cell: (917) 805-0783