STS Film/Video Productions of Salt Lake City has opened an office in Irvine, Calif., to service California businesses with film and video production, according to Rick Larsen, sales manager.

Since STS entered the California market in 1981, the company has dealt with California businesses through its 75,000-square-foot Salt Lake facility. "Now we have a California base where we'll have a daily presence to meet client demands for film and video production services," he said.STS, a subsidiary of American Stores Co., had a 25 percent increase in sales during 1988, necessitating opening an office, said Larsen.