From the North, take the Baltimore Beltway, I-695 to I-97 South. Take exit #7, Rt. 3 South, Rt. 3 turns into Rt. 301 South of Rt. 50. Stay on Rt. 3/301 past Rt. 4. Turn left at the 2nd Old Indian. Head Road (across from Cheltenham Woods). Go about 80 yards, turn right into SMA.
From the Washington Beltway, I-495, take exit 11A, Rt. 4 (Pennsylvania Ave. south/east). Then take Rt. 301 South and follow the above directions.