Saturday Fun Activity: Where IS this?

     In my 30 years of reporting for the Sun-Times, I've had cause to be there exactly twice, the second time last week. It is probably the most prominently-located yet completely-obscure place in Chicago—known to a select few, the masses not only kept out, but kept in ignorance of its existence. It wants no publicity. 
     Which is a shame, because the place has a wonderful back story, of why it's so improbably there, where it was no longer supposed to be.  I'll tell you the story of its endurance after somebody guesses where this is—this might be one of those that gets cracked early, by somebody who, like me, was invited in once or twice. Or maybe not— everyone I mention this to just gives me a blank look. Then again, maybe I just travel in lumpen circles. Maybe you go there all the time. Lucky you. Either way, hard or easy, today's question is: where are these lovely double swans? What IS this place? Since my stock of posters is dwindling, the winner will get ... a copy of my 2012 memoir, You Were Never in Chicago. Post your guesses below.  Good luck. 

POSTSCRIPT: Location cracked, but not at 12:05 a.m. this time, so I consider today's puzzle a success. Here's a shot I didn't want to print earlier, so as not to give away the game, to show you where today's location, revealed below, is located—that lovely oval dining room is secreted within this all black building, tucked behind the John Hancock's parking garage.