The Los Angeles County Board of Supervisors gave its approval Tuesday for Walt Disney Co. to build a movie production studio in the Santa Clarita Valley.

By a 4-0 vote, the supervisors voted to change the zoning of 44 acres from an agricultural use to a commercial-manufacturing zoning designation, the last approval the project needed. The county regional planning commission voted in favor of it in June.

The studio will feature Disney 12 soundstages, enough space for up to six one-hour dramas to be filmed simultaneously. It also will include production and administration offices, a commissary and talent bungalows.

The Burbank media giant is making an undisclosed multimillion investment in its Disney ABC Studios at the Ranch project, which is on its 800-acre Golden Oak Ranch property in an unincorporated valley area off State Route 14.

Shows have been filmed at the Golden Oak Ranch property since the late 1950s, starting with the “Mickey Mouse Club” and scenes from “Pirates of the Caribbean.”

Shares of Disney lost 66 cents, or about 1 percent, to close at $60.69 on the New York Stock Exchange.