Take the Red Line to Bethesda. When you exit the station, walk up Wisconsin Avenue heading north (the address numbers should be getting higher).
A few blocks up the road, make a left on Cheltenham Street. At the end of the block, Cheltenham intersects with Woodmont and Norfolk. Cross to the corner with the tiny park. Our white building is just down Norfolk, on that park.
Questions? Ask away. Marching orders? Ten-hut! Confessions? Do tell.