The Address of the Xenophon

From Randy Cohen, "We Mapped Manhattan," in The New York Times http://www.nytimes.com/2005/06/05/books/review/05RAND01.html? (free registration required):

Some mysteries remain -- the apartment of J. D. Salinger's nomadic Glass family, who seem to move from East to West Side; the address of the Xenophon, where William Dean Howells's March family found a sublet in ''A Hazard of New Fortunes.'' Nor could we confidently pin down the office of Bartleby the Scrivener, despite many good suggestions from readers, including Ann Sullivan-Cross's. Having had a job at 14 Wall Street -- ''like working in a dead letter office, at the depths of a dark world governed by dark laws'' -- she felt sure she recognized the spot; she pointed out, moreover, that Melville's brother Allan had a law office at that address.