The zoning change would allow Lagunitas to move forward with its plan of creating a small venue for occasional concerts within its existing 300,000-square-foot facility at 2607 W. 17th St., similar in spirit to the amphitheater at its Petaluma, Calif., brewery. Lagunitas also intends to expand its existing taproom and boost its operations with a second bottling line and cold storage facility, said spokeswoman Karen Hamilton, who's sister of Lagunitas founder Tony Magee.