It is a Yakuza-controlled casino, named after the co-leader of the Yakuza, Kenji Kasen. Claude gets jobs from Kenji here in Grand Theft Auto III. There are rumors the police have an investment in the casino, but this was never proven. It took over from the Big Shot Casino sometime between 1998 and 2001. Although Kenji's Casino may be an interesting place, it is inaccessible, however, there is a hidden package on the rooftop helipad. In several pre-mission cutscenes, a garden area is seen on a roof of the casino and can be reached with the Dodo. One part of the garden is unsolid which will cause the player to fall through the floor into the building space.
- GTA III
http://www.rockstargames.com/grandtheftauto3/flash/casino/index.html - Teaser site for the casino, where it is referred to by its possible beta name of Oicho-Kabu Casino.