There is a taxi stand at the Rockridge station, and it's not at all unusual for there to be a taxi or sometimes even two waiting there during the day. The ride would probably be about 1.5-2 miles, which is to say, under $10.

Of course, if you don't see a taxi, you might take a few minutes to enjoy some of the stores along College Avenue, such as the Rockridge Market Hall (good bakery, coffee, and gourmet foods), Pendragon books or Diesel books, Bittersweet (a chocolate cafe), or Rockridge Home (good furniture, home decor, and gift-related items). The proprietor, Jennifer Kaplan, is great with advice if you have an idea of what you might want, and has selected items that are at once practical, interesting, and often by Bay Area designers and artists!).

-Hayden