801 22nd Street, San Francisco
UPDATED 3/1/16: Formerly Chocolate Lab, then theLab Café, and now simply theLab was started by Michael Recchiuti of Recchiuti Confections so he could use his pastry chef background to offer chocolate oriented desserts, chocolate drinks and other food beyond confections.
It has gone through several iterations. Currently, it is a special-events venue that is also available for rent.
Always check the website for the latest options at this unique place.