As a strong supporter of Metro's Westside Subway project, I also support the Century City stop being at Constellation and Avenue of the Stars, in the center of the community.
As rail runs under the Pentagon, I'm not too concerned about tunneling under Beverly Hills High School. I have lived in New York and London where tunnels safely went under all kinds of buildings.
That said, if the Century City station on the Purple Line extension were on Santa Monica Blvd. instead of Constellation, wouldn't that create tremendous pressure to sell Los Angeles Golf Course and redevelop the north side of Santa Monica Blvd. into "Century City North", and pour even more traffic onto Beverly Hills?
As someone who balances idealism and cynicism, I have to wonder: Are there any people calling for the Metro Purple Line stop to be on Santa Monica Blvd. because they secretly WANT to develop Century City North and are hiding behind the Beverly Hills High School "safety" issue? Obviously the Purple Line extension should be built as safely as possible. But how much of that opposition to tunneling under Beverly Hills High School has another hidden development agenda or behind it, or a consequence of it?
Be wary of the law of unintended consequences. It would be ironic if Beverly Hills got what it wished for only to see Century City North developed.