[ProphetM]

Originally Posted by MichaelRyerson

City Hall from Fort Moore Hill, Arnold Hylen, 1951

Nice, typically stark Arnold Hylen shot of City Hall. But look right there in the middle distance, right behind that chain link fence. See that 'curb'? I think that's the south portal of the ever elusive Hill Street tunnel no. 2.

California State Library, California History Room

You are absolutely right! I didn't even notice when the photo was posted earlier.