This newly completed castle like mansion is located at 3015 Lincoln Road in Oak Brook, IL. It contains 18,000 square feet of living space that includes a massive 30ft x 60ft great room with cathedral ceilings, 12 skylights, a 500 square foot kitchen with adjoining dining room, 5 bedrooms, 8 bathrooms, an elevator, 3 fireplaces, a family room, a climate-controlled wine cellar, and a 4 car heated garage. 
*There is also another large mansion being built right next to it

This mansion is truly spectacular. I included it in one of my posts a while back and now it is finally for sale! The home sports a 15,000 square foot main house, a swimming pool, a large pond, a 6+ car garage, and a massive indoor basketball court/gym (the large white building). It is located at 7 Fox Hunt Road in Barrington, IL and contains 8 bedrooms and 8 bathrooms. It is listed for $14,500,000.

This red roofed large mansion looks to be in excess of 20,000 square feet. It is located at the end of Falcon Court in Barrington, IL. As you can see, its massive compared to the surrounding homes. Also, if you look at the 2nd picture, there is another recently completed mansion to the north of it.

This newly constructed large mansion is located at 9 Blossom Court in South Barrington, IL. It is situated in the prestigious Magnolia Pointe area, where homes are well over 10,000 square feet. The home contains 5 bedrooms, 8 bathrooms, and 18,000 square feet of living space. It is listed for $3,045,000. That is pretty good, considering a home of that size would cost over $9,000,000 in NJ.