We did this route from the ground up. There is a lot of lichen, and you may have to dig a little in the crack to get a placement.
The route ascends the crack to the left of the left-facing corner right of Unknown 2. The route climbs through orange lichen and rock. Start by scrambling to the top of the detached, left-leaning pillar. A key 1.5 inch placement above and behind you protects the next moves and will keep you off the deck. Climb the shallow crack up and left to the ledge. Climb the layback hand crack up and to the right to the roof above Unknown 3. Climb through the roof, skipping the bolts for Unknown 3 and placing gear instead.
This is right of Unknown 2, see the photo.
Pro to 3 inches.