The Lampert-Wildflower House remained in the Lampert family until long after Phillip Lampert's death. Clara Lampert died in 1962 and her daughter Muriel died in 1972. Muriel Lampert left the house to local historians Bessie and Emmett Sullivan; the house stood empty until Bessie Sullivan's death in 1986. In 1986 two men from Grand Prairie, Illinois bought the house and ended up selling it in 1988 to Sherry and Gary Knott-Simon, who set about restoring the home while maintaining its historic character and integrity. The house was added to the National Register of Historic Places for its local and architectural significance as a typical example of Upright and Wing style on August 12, 2005.