We suppose this was the Auditorium Hotel.  If so, it’s now a National Hstoric Landmark and the home of Roosevelt University.  If not, we apologise … The card seems to have been mailed in 1905 or 1907, with stamp and postmark.  We say “seems” because someone has written 1905 on the top front but the postmark looks more like 1907.  Does it really matter?  Grade: 3