I don’t know when this aerial view of the Beverly Hills Hotel was taken, but it must be pretty early. The wing facing Crescent Drive hasn’t been built yet, and those tennis courts are kinda sorta where the swimming pool is now. Another clue that this is an early shot is to look at the surrounding land. There is more empty land than there are residences, so I’m guessing probably early 1920s.
And how it looks in 2016: