Disclaimer: In order for this to be an actual challenge, we had blurred out the building's sign on Photoshop.
Where can you find this building? Do you know what it is a building of? A clue in the picture may help you.
Thanks to reader Keith Barros for sharing this week's photo!
Post your guesses in the comments section below.
Guess correctly and be crowned "San Lorenzo know-it-all" for the week.
Congratulations to Mike for being the first to correctly guess The fence is part of the .
Have your own photos around town that you'd like featured in Castro Valley Patch's photo challenge? Send them to firstname.lastname@example.org and see if you can stump our readers!