Forest–Ivanhoe Residential Historic District is a national historic district located at Hammond, Lake County, Indiana. The district encompasses 25 contributing buildings in an exclusively residential section of Hammond. The development began before 1923, the year its first house was constructed, on what had been "Eggebrech's Second Tract" that was sold around 1919. The builder Karl Hohenberger obtained the land and then saw his real estate development financed in part by Al Capone, who enabled him to build the first house according to his specifications that included steel skeleton to support the massive weight of a Spanish barrel-tile roof and concrete floors between the house's stories. This house also features the inclusion of steel plates in its outside walls in order to render it bull