The penthouse: the pinnacle of urban living. These places can have it all: panoramic views, enormous terraces and room to entertain. In many cities, they are dream residences, smack in the middle of the hustle and bustle. Here are our picks of penthouses in U.S. cities that present lofty and luxurious living in all its splendor. Tour these properties and elevate your day, 2 are in Chicago.