Directions to MDSI Corporate Headquarters From I-285: Take Peachtree Industrial Blvd/141 North. Continue five miles North to the Peachtree Parkway split. Stay to the left and continue north on Peachtree Parkway two miles to Spalding Drive. Make a left onto Spalding Dr, turn right onto Triangle Parkway. Take an immediate left and right and look for the 5445 Spalding Ridge Building on your right. We are located on the 1st floor in suite 170.