ARCH is at the corner of Missouri and 17th Streets, at the base of Potrero Hill. Look for the bright copper metallic building with the silver roll-up door. The parking lot entrance is just before the building coming from 16th Street. The address, #99, is just to the right of the entrance.

BUS
22 Fillmore: exit at 17th and Connecticut, walk east one block

10 Townsend (from the bottom of market): exit at 17th
and DeHaro, walk east five blocks

19 Polk (from the civic center area): exit at 17th
and DeHaro, walk east five blocks

BART
16th Street Exit: walkers to east approximately 1G miles
on 16th Street, then west on 16th to Missouri, left to arch; bus riders take the 22 fillmore going toward 22nd and Third, exit at 17th and Connecticut

AUTO
From Downtown (market st.): go south on 5th to Townsend, right on Townsend, then left at 7th. At the 16th Street stoplight, turn right, then the first left is Missouri

From Golden Gate Bridge Area: take Lombard Street, go right to Van Ness, crossing Market and Mission (becomes South Van Ness), turn left at 16th Street, right onto Missouri

From Bay Bridge: take the 5th Street exit, go left at 5th Street, it ends at Townsend, go right on Townsend, turn left at 7th Street. At the 16th Street stoplight, turn right, then the first left is Missouri

From The Embarcadero: take Embarcadero to King Street (next to AT&T Park), go left on Third, right on 16th Street, then left on Missouri

From 280: take the Mariposa exit, go west to Missouri Street four blocks, turn right, go downhill to Missouri

From The Richmond District: go east on Geary to Van Ness/South Van Ness, turn left at 16th Street, right onto Missouri

From The Sunset: take Portola to Market, go right
on Valencia, turn left at 16th Street, right onto Missouri

From South of the City: take 101 North, exit
at Vermont Street, right on 16th Street to Missouri

Mapquest info here.