In 2285, Doctor Leonard McCoy visited this bar to hire a transport ship which should bring him to the planet Genesis in the Mutara sector. He found someone, an alien, but was stopped and arrested by a civilian agent. (Star Trek III: The Search for Spock)
The script describes the bar as, "A crowded, smoke-filled watering hole of the twenty-third century, filled with a smattering of civilians, Starfleet personnel, and visitors from strange and far-off civilizations. It does not have the bizarre qualities of the 'Star Wars Bar' which is across the street." 
The bar was featured in the scenes 79-83. According to the above mentioned script, there was an alternate scene, in which several stunt performers appeared. This is supported by a costume worn by stuntwoman Jeannie Coulter, who doubled Sharon Thomas  , and the appearance of stuntman Tom Morga.