I read about the 1 hr parking thing from other yelpers, and the dude who checks if you actually leave after an hr exists. I went into the parking lot in the back of Cartel Coffee Lab, and the guy (who's in a white shirt with "parking security" or whtever) was walking around with this pen and notebook in hand.
The inside of the coffee lab is pretty big. lots of tables to chill at. I had the cold brew, which was $2.50. It was pretty good. I would need to try other drinks they offer to better review them, but from what I experienced today, I wouldn't mind going again.