In our Georgia MLS systems the west side of north Fulton County is referred to as "Area 13!"  To the south side it is bounded by the Chattahoochee River, to the East it is bounded by the GA 400 and to the north... Forsyth County and to the west Cherokee and Cobb Counties.  Sales in Area 13 have long led the Atlanta area and contain sought after cities of Roswell to the South, The City of Alpharetta, and the City of Milton.  Recently homes sales as in many areas of the United States have fallen off dramatically, and home prices are softening.  Home sellers and buyers need to be aware that what homes were selling for in the last few years, have no bearing on today's prices.