The Stamford Advocate reports that Peter Lanza's house in the city's well-to-do Westover section has an asking price of $710,000.
Listing agency Halstead Properties describes the home as a 2,375-square-foot ranch cape on 1.04 acres of land, with three bedrooms, two-and-a-half bathrooms and a pool in the backyard.
The 54-year-old Lanza and his second wife have lived in the house for about five years.
In December, Adam Lanza shot to death 20 first-graders and six educators at Sandy Hook Elementary School before killing himself as police arrived. He also shot and killed his mother, Nancy Lanza, at their Newtown home before going to the school.
Peter and Nancy Lanza's divorce was finalized in 2009.