Season 4 of Boardwalk Empire is just around the corner, debuting Sunday, September 8 at 10 PM ET on HBO with "New York Sour". The network has released a behind-the-scenes featurette that introduces us to one of the show's new locales this season, The Onyx Club. Set decorator Carol Silverman explains that it took two to three months just to design the club, which Chalky White (Michael K. Williams) builds after striking a deal with Nucky Thompson (Steve Buscemi). Go behind-the-scenes to see early design sketches and footage of the crew assembling this new set before the Season 4 premiere airs this weekend.