The residence is built on the same lot as the William Theisen mansion, a sprawling 20,125-square-foot house that was the largest in Omaha when it was completed in 1983. A family currently resides in the seven-bedroom, five-bathroom house, which features a swimming pool located on the western side of the house.  Photo 15 of 20 in 20 Modern Homes From the Midwest from Omaha Art-Inspired House