Visit the Ontario Historical Society and the historic John McKenzie House during 2025 Doors Open Toronto. Visitors will have the chance to explore the historic house and headquarters of the OHS, and learn how the historic building was saved by the community, and still functions as an active community space to this day.

The John McKenzie House was built in 1913, in a style described as Queen Anne Revival, Arts and Crafts, and Edwardian. The grand, red brick house is profiled by a large L-shaped veranda with stylized Doric columns. Significant interior features include the centre hall plan, a vestibule door and sidelights with beveled and leaded glass, a large leaded art glass window that lights the landing of the main staircase, panelled doors, and original radiators. In 1993, the Ontario Historical Society (OHS) entered into a partnership with the former City of North York to preserve and restore the John McKenzie House, which serves as the provincial headquarters of the OHS.