Go about 1 mile until Third Street merges into Fourth Street (Shell station is on your right when Third ends-there are no Street signs to indicate this). After the Shell station (and light) a third lane of traffic appears on your right. Move over into this far right lane (carefully, as there is traffic coming in on the right). Just a few buildings on your right is 1924 Fourth Street. (It is before the Sun-Tanning sign painted high on a building wall.) There is a parking lot. The building is set back. Go up external staircase.

If lot is full, street parking is available.
If you drive past the parking lot, park on the street and walk back.

From the North:
Take Hwy 101 South to the Central San Rafael Exit. Turn right on Third Street. See above.

From the East Bay:
San Rafael-Richmond Bridge to 101 North. See above.