Reclaimed wood is probably at this point the expected material that you'll have in your new airy cafe and/or restaurant in SF. You definitely can't have a MacBook Air cafe without it, and you will also probably find patrons expecting it in your expensive revival bar, local wine bar, cheese shop, chocolate shop, dog water vendor, bread pudding parlor, and grilled cheese late night hot spot.
This is a nice article about the symbolic meaning of reclaimed wood. Here's a mention of reclaimed wood as a tired element in SF restaurants.
You can get reclaimed wood in many places in SF.