SF-51C Sweeney Ridge N 37.61337°, W 122.45888°, elevation 1260 feet

The IFC site still has many buildings standing, although vandalized. Access: it can be reached by a steep hike/bike of a few miles from the trailhead at the end of Sneath Lane, off of I280. Once you reach the ridge line, turn north.

You can't quite read it (even with click-to-zoom), but the red text next to the window of this burned-out building says "NO SMOKING IN BED".

This solitary building is actually about halfway between SF-51C and SF-51L, on the Nike road connecting the two. Maybe it was a microwave relay.

• SF-51L Milagra Ridge, 2.1 miles NW