The Wisconsin Historical Society dates this postcard at about 1910 and that would seem right except that the one we have was mailed in 1909, with stamp and postmark and long, hard-to-understand message.  Other sources go back even a few years earlier, and as it is an undivided back (divided by the writer with a line!), we think the correct date of publication could be 1906 or 1907.  Anyway, the hotel is long gone.  Grade: 1