We live in Novato and found a scorpion in the back of our leather chair on the ground floor. The ground floor has crawl spaces underneath. I looked at the picture and description in the Western Exterminator web page and it is definitely a scorpion, but more browning in color. Only the legs and stinger end of the tail are yellow. It is about 1 inch long.
Small scorpions are common in the parts of the bay area.
Their sting is similiar to that of a bee sting unless you have an allergic reaction to the venom. Scorpions hunt at night and it is correct that sometimes they can be found in shoes, etc that left on the floor or outside the door. I suspect that it wandered in from outside via the crack under a door and you will not be bother by anymore. A good cultural control for scorpions invading homes is to simply eliminate entry points by using rubber molding under the doors, or by placing a towel down to block the gaps. We got your email address from the Citybugs website, and have a question for you.