The Clark Center (318 Campus Drive) is near the School of Medicine and across Campus Drive West from the Gates Computer Science building. Going west/south on Campus Drive (counter-clockwise), it is the first building on the right after you cross Roth Way.
Park in the parking lot on the west side of the building, walk into the center of the building, and up the diagonal outside staircase to the 3rd floor. Enter by walking through Peet's Coffee; s360 is the first door on your right, and s361 is just down the hall.