UrbanDaddy has a first look at singer-songwriter Gavin DeGraw’s new blues bar National Underground in the old Martignetti’s Liquors space (remember when Anthony Martignetti was just a lowly dive-bar owner?), which we’ve discovered will eventually include a downstairs where live acts will rock out after acoustic acts end at 10 p.m. upstairs. Co-owner Duggins King (longtime co-owner of Terra Blues) tells us he’s also planning to add about a dozen beers on draft and a food menu that he says will challenge Burger Joint for the best cheeseburger in town. Color us skeptical, but King assures us, “I come from Texas and my partner comes from upstate New York. We’re a couple of country boys who like cheeseburgers. If it tastes right, we’ll serve it. If not, we won’t.” We’ll have to wait till February to see about that, but in the meantime, the bar part of the operation opens on Thursday.

National Underground, 159 E. Houston St., at Allen St.; 212-475-0611.

The National [UrbanDaddy]