These outdoor areas are used to camouflage an even more elaborate subterranean world. A grand concrete staircase, carved into the center of the park, leads down to a convention hall and meeting rooms. Light filters into some of these rooms through windows in the bottom of the reflecting pool, giving them the feel of an aquarium. Once you’re down there, you realize that the two biggest hills in the park are artificial: one houses a 500-seat theater, the other a restaurant.

The abundance of social spaces — and Mr. Holl’s intuitive understanding of how to reconcile the desire for community with the need for privacy — is as true of the parts of the building devoted to offices as of the park. Elevators hidden inside the structural piers let out onto an assortment of lounges: grotto-like, multilevel rooms that are carved out of the office volumes and that serve as informal meeting areas.

The office floors themselves have none of the monotonous corridors we expect to find in a conventional corporate building. Instead one space opens onto another, with small clusters of cubicles interrupted by glass-enclosed meeting rooms where workers can retreat for privacy. At each turn, views open up to the nearby mountains or down to the gorgeous coastline, whose dramatic bluffs look like something from the opening credits of a Bond movie.