Arthur Zankel, the financier who gave $10 million for the Carnegie Hall recital space that bears his name, plunged to his death from his ninth floor apartment in an apparent suicide, police said Friday. He was 73. Zankel, Carnegie Hall's vice chairman, died Thursday at New York Hospital after apparently jumping from his Fifth Avenue apartment, Detective Noel Waters said, confirming a report in The New York Sun. Waters said Zankel jumped around 11 a.m. Thursday and landed in a rear courtyard. Zankel, a member of the Citigroup Inc. board of directors from 1986 until last year, specialized in real...