After failing to find a buyer for his massive Illinois estate -- listed 18 months ago for $29 million -- Michael Jordan has put the place up for auction.

The 56,000 sq. ft. monster of a mansion and separate guest house sit on several acres in suburban Highland Park, right on Lake Michigan.

All the rooms are super-sized to accommodate the former NBA superstar, who lived there during his marriage to first wife, Juanita. The place is being sold fully furnished.