Rules governing strip clubs and the overall adult entertainment industry vary around the world and formats sometimes are combined under a single roof or complex. In Bangkok, Thailand, the Nana Entertainment Plaza in downtown Bangkok is a large, four-floor compound with over 40 bars. Most of the bars are go-go bars with dancers in various stages of nudity. They are not formal brothels, since customers must negotiate without an intermediary, directly with the dancers, for services up to and including sex. Zürich, Switzerland has legalized prostitution and its strip clubs throughout the city offer sex among their services. Differing from Zurich brothels, sex services via the strip clubs are typically performed off site. Eastern European strip clubs have a similar model. A .34 square kilometer "sex zone" in Tokyo, Japan had approximately 3,500 sex facilities as of 1999. These included strip theaters, peep shows, "soaplands", "lover's banks", porno shops, telephone clubs, karaoke bars, clubs and more all offering adult entertainment services. In Dubai, a nation governed by very strict cultural norms and laws, there are several Indian strip clubs offering at least partial nudity.