3100 San Pablo Ave, Suite 170, Berkeley
In 2005, two founders of Wired magazine brought their tech savvy to chocolate making with a new company called TCHO. They started on the SF waterfront, but now have a factory in Berkeley. Their bars, tiles, cooking chocolate, and drinking chocolates are available around the world.
TCHO occasionally offers tours of their Berkeley factory. If you are interested, sign up for their newsletter on their website or follow them on Eventbrite.