Penthouse Fever: $4,000 Per Square Foot

In the Chicago Tribune, Leonor Vivanco writes about ten top penthouses, including Chicago's highest, and highest-priced, condo unit, ever:

The Chicago Spire is touting a 10,000-square-foot, two-floor penthouse unit near the top of the 150-story twisting tower. The customizable space, which takes up floors 140 and 141, will offer 360-degree, floor-to-ceiling views of the city and the lake. The two floors could be connected by a glass staircase. The price tag: $40 million--about $4,000 per square foot, the most ever for a Chicago condo. The penthouse is set for completion in 2012.

At the 92-story Trump International Hotel & Tower are nine penthouses. The largest, a 14,000-square-foot space that takes up the 89th floor and has 360-degree views of the city, has no disclosed price tag and isn't on the market yet. The other eight, on floors 86 to 88, range from 2,350 square feet to 6,850 square feet and are priced from $3.3 million to more than $9 million [roughly $1,400 psf]. Half of these units have been sold.