There's a video from NBC on the site that says they were originally asking 2.3 million. It's currently listed at 1.65. If I had the money, I'd buy it. I love mid century modern houses and this one will definitely appreciate.
From the listing: "The 4 bedroom, 5,300 sq. ft. landmark was designed by A. James Speyer and David Haid in 1953. The price is now reduced to $1,650,000. Not bad for a historic landmark of modernism just outside Chicago".