From I-270 take the #11 Exit (Montgomery Village Avenue) At the intersection of Montgomery Village Avenue and Route 355 (Frederick Avenue) turn left heading North. Take 355 North for approximately 1 mile. You will go past Costco and the car dealerships on your right. Make a left on Professional Drive and an immediate right into the first driveway until the very end. We are in the last suite (#239) on the right.