Update (4/21/10): Three more firms have been confirmed: Snohetta, Rafael Viñoly, and L.A.’s Frederick Fisher. This is shaping up to be a pretty diverse crew.

The SF Chronicle reports that the Berkeley Art Museum/Pacific Film Archive has sent out letters to ten architecture firms, asking them to submit qualifications to design their new home.  Adding to the three that have already been sussed out (Bernard Tschumi, Tod Williams Billie Tsien, and Will Bruder), we have confirmed a fourth: Ann Beha, whose Currier Museum of Art in New Hampshire has been well-received.

If that partial list is any indication, the museum is looking at a more diverse group than SFMOMA is considering for its addition, though (as in SFMOMA’s case) no local names have surfaced yet.  It is  going to be an interesting adaptive reuse project:  the old printing plant on the site will be renovated, and a 50,000 square-foot addition incorporated into the whole.