THE STATELY 23-STORY HOTEL OPENED AT the height of the Jazz Age, but less than a year later, Wall Street’s 1929 crash snuffed out revelry in the opulent ballroom and secret speakeasy. That’s when the property, then one of Baltimore’s tallest buildings, supposedly began accumulating ghosts: failed businessmen, wiped-out tycoons, even a bankrupt couple reputed to have jumped to their deaths on a downtown street with their young daughter.