From Atlanta take Route 400 North to exit 12A which is McFarland Road. The exit forces you to the right (East). Stay on McFarland a little less than 2 miles to the T. Turn left onto McGinnis Ferry and then an immediate left again onto Old Alpharetta Road. The office is 1/2 mile up on your left.
Alternatively, instead of going all the way to McGinnis Ferry, turn left at the traffic light before McGinnis Ferry (3rd traffic light from 400) (Curie Drive). Go through the short industrial park (1/2 mile or so) and the road will T into Old Alpharetta Road. Turn left and our office is roughly a quarter mile on the left.