The gym/dancefloor/swimming pool in in "It's a Wonderful Life"

Was that scene filmed at Beverly Hills High School?
I know the school is very old, and they have a gym floor that opens up to a swimming pool.

Yes:

Thanks for the reply and excellent, interesting link.

I’ve wondered that for decades.

I remember seeing the pool when I was a kid.

To be fair, I think Los Angeles HS also had a pool by then.

Did the phenomenon ever spread beyond Soutghern California (say to middle-sized towns and small cities in the northeast like the fictional “Bedford Falls”)?

And isn’t that Carl “Alfalfa” Switzer who turns the key to open the pool?

I don’t know about Spectre’s or Doug’s questions, but as for waits’ (from the same site):