Take the Washington, DC, Metro red line to the Twinbrook Metro stop (note: when coming outbound on the red line from downtown DC, be sure to board a train destined for Shady Grove; Grosvenor-bound trains run the same direction but turn around before the Twinbrook station). The RAPS offices are about a two block walk from the Twinbrook Station. When exiting the Twinbrook station, come down the steps of the metro and take the East exit, to your left. You walk across two pedestrian crossings to the car park (this is also the bus pick up area). Proceed to walk in a diagonal direction across the car park to the exit at the far side surrounded by trees.
When walking you should see the gas station and the US Pharmacopeia building. Walk across the street on to Fishers Lane. RAPS is in the second building on the left (which is next door to USP), at 5635 Fishers Lane. We are on the 5th Floor in Suite 550. For more information on using the Washington Metro, please visit the WMATA site