Working on this for my Kaidan setting module: the Gift, a niteclub/gambling hall and brothel called the Dragon Club, is operated by the Yakuza.
The Pit is a martial arts fighting arena, note the tatami mat floor. The mats are removed during dog fighting. A judges table sits to the south of the pit.
The rooms to the west are reserved for private parties, business meetings and courtesan activity (notice the floor futon and pillows for that.)
The raised floor to the north is the dining/card playing/sake serving tables, a bar sits on the north end.
Rather than the usual tavern or inn, I thought a yakuza niteclub might prove something useful and different. This could very well be used in a modern setting as well, with just a traditional layout.
Enjoy!
GP

