That's enough to get his name on the museum's theater. The $25 million is the largest commitment to date for the $300 million capital campaign (more than half the goal has been met). The museum is expected to be complete in early 2017. From press release (via Deadline):
Designed by architects Renzo Piano and Zoltan Pali, the Academy Museum will be located next to the Los Angeles County Museum of Art (LACMA) in the historic Wilshire May Company building. Slated to open in early 2017, the Academy Museum will contain nearly 300,000 square feet of state-of-the-art galleries, exhibition spaces, theaters, screening rooms, education centers, and special event spaces. The design for the Academy Museum fully restores the Wilshire and Fairfax street-front facades of the original 1939 Streamline Moderne building. It also includes a spherical wing at the northern end of the original building that will replace an extension made to the structure in 1946. Designed to represent the marriage of art and technology, the wing will house The David Geffen Theater and will be a spectacular new piece of contemporary architecture that will perfectly complement the historic building.