The city of Chicago is known for many things. It is known as The Windy City more for its politics than for its weather. It is well known as the home for many of the works of architect Frank Lloyd Wright. It is the home of the Merchandise Mart which is the only building in Chicago (and maybe the country) that has its own zip code (60654).
Skunks usually nest in burrows constructed by other animals, but they also live in hollow logs or even abandoned buildings. In colder climates, some skunks may sleep in these nests for several weeks of the chilliest season.
Checking under your porches, sheds, patios and crawl spaces for openings that need to be sealed can keep skunks from coming into your home in search of food as well. If you have trees or bushes that harvest fruits, berries or nuts, check your yard often in search of those that have fallen on the ground and remove them.