I just learned from Val at the wonderful Hob Nob tours that the phone and address for Hob Nob is incorrect in the new Northern California: An Explorer's Guide. The correct contact information is 650-814-6303 and P. O. Box 2302 Livermore, CA 94551. As you might expect with us humans, we occasionally mess up. I hope you all understand and forgive my blunder.
For detailed information about the excellent Hob Nob Tour of Nob Hill, pick up Northern California: An Explorer's Guide (Countryman Press).