GIS is an acronym for Geographical Information Systems. Municipalities setup online databases that show previous sale prices, tax assessments and other useful information. It is commonly referred to as GIS. I hope this helps. - Sun Jul 20 2008, 20:01
Check your local tax records. The best way is to search via the internet on your county or city's GIS or real estate valuation dept. online. It may take a little while to update from the recordation of the deed. - Sun Jul 20 2008, 14:29
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