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!
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Post your guesses in the comments section below.
Guess correctly and be crowned "San Lorenzo know-it-all" for the week.
Find out what's happening in Castro Valleywith free, real-time updates from Patch.
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 analisa.harangozo@patch.com and see if you can stump our readers!
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