Gps Is Easiest. From The I-285 And Ga-400 Interchange, Take I-285 East And Exit At Ashford Dunwoody Road (Exit 29). Turn Right Onto Ashford Dunwoody Road, Then Left Onto Lake Hearn Drive. Continue By Turning Right Onto Parkside Place And Then Right Again Onto Perimeter Summit Boulevard; Your Destination Will Be On The Left.