Keyes spokeswoman Connie Hair says the Republican candidate moved out soon after he lost the election to Democrat Barack Obama.
Hair says Keyes always maintained that the Calumet City residence was only temporary. She says he now has a condo in downtown Chicago.
Republicans drafted Keyes from Maryland this August after the winner of the primary, Jack Ryan, dropped out amid a sex scandal.
Hair says Keyes has been traveling the country since the election and giving speeches. He also has spent time in Maryland and Chicago.