Co., located in Chelsea, is the new pizzeria from Jim Lahey of Sullivan Street Bakery. The interior space with 54 total seats, mostly at communal tables, is minimalist, but the restaurant is bustling with patrons and high energy. The atmosphere is that of a restaurant not a pizza joint. There’s no doubt that Sullivan Street Bakery makes some of the best breads in town, so pizza doesn’t seem like a far-fetched expansion. And, indeed, the highlight at Co. is undoubtedly the dough, with the pizza bianca even tastier than the one sold at Sullivan Street Bakery. The pizza bianca in its simplicity of just dough, olive oil, rosemary and salt, looks a little like nan, but don’t let its plain demeanor fool you. It’s as delicious as baked dough gets.