Post your guesses in the comments section below.
Guess correctly and be crowned "Castro Valley know-it-all" for the week.
Congratulations to reader who was the first to correctly guess . The drive-up sign can be found on the side of off Castro Valley Boulevard.
Unfortunately, due to technical issues on our site last Saturday, her answer never got posted in the comments section of the article. However, we spotted it in the comments stream on the main page of our site.
Our other reader , also answered correctly within a matter of minutes after Theresa.
Have your own photos around town that you'd like featured in our Castro Valley photo challenge? Send them to email@example.com and see if you can stump our readers!