Preservation Groups Seek Landmark Status for Englewood’s O’Leary Mansion

Landmarks Illinois and Preservation Chicago are pursuing landmark designation to protect the O’Leary Mansion, a 33‑room historic structure in Chicago’s Englewood neighborhood.

The mansion was constructed around 1900 by James “Big Jim” O’Leary, a well‑known gambling figure of the era. Preservation advocates argue that the designation would safeguard the building’s architectural and historical significance.