Originally built in 1883 by an Irish immigrant, this house has spent the last several decades as the HQ of the advertising agency Flair Communications. It now heads to the market to be sold as a private residence. The historic four story home was purchased by Flair chief Lee Flaherty back in the '60s and subsequently received a major overhaul which took years to complete. The Flair House, which has earned numerous designations over the years, might just be Chicago's most eccentric home. And there's certainly no denying that it is unique. At 7,000 square feet in size and location in the popular River North neighborhood, it won't come cheap. Fresh on the market, its introductory ask is one dollar short of $3 million.