From Springfield:

Take FAIRFAX COUNTY PKY(VA-7100 N). Take ramp onto OX RD(VA-123 N) toward OX ROAD NORTH - go 4.4 mi. Turn Right on WEST ST - go 0.1 mi, Turn Left on MAIN ST(VA-236 W) - go 0.6 mi, Make a U-Turn at OAK ST onto MAIN ST(VA-236 E) - go 0.1 mi. Arrive at 10721 MAIN ST on the Right.

From Alexandria: 

Take 495 west to exit #52A/LITTLE RIVER TURNPIKE/FAIRFAX, go about 6.2 mi. Make a U-Turn at OAK ST onto MAIN ST, go 0.1 mi. Arrive at 10721 MAIN ST on the Right.

From McLean:

Take 495 south to exit #49/ I-66 W - go 4.6 mi. Take exit #60/ CHAIN BRIDGE RD(VA-123) toward FAIRFAX - go 1.4 mi. Turn Right on FAIRFAX BLVD(US-29 S) - go 0.5 mi. Turn Left on OAK ST - go 0.4 mi. Turn Left on MAIN ST(VA-236 E) - go 0.1 mi. Arrive at 10721 MAIN ST on the Right.

From Centreville and Manassas:

Take I-66 E toward WASHINGTON, Take exit #57A/ LEE JACKSON MEMORIAL HWY(US-50 E) - go 1.7 mi. Bear Right on MAIN ST(VA-236 E) - go 0.5 mi. Arrive at 10721 MAIN ST on the Right.