The co-op at 834 Fifth Avenue is the kind that would most certainly disdain denim-wearers at a board interview (current owners include Rupert Murdoch, Paul Cejas and John Gutfreund). But what if you are a denim heiress? Well, apparently, that’s O.K. According to city records, brokerage baron Charles Schwab and his wife, Helen, have sold their petite penthouse on the [...]