Ontario Heritage Toolkit Ontario Heritage Act, R.S.O. 1990, c. O.18 Ontario Heritage Act Part IV Designations Ontario Heritage Act Part V Designations List of Heritage Conservation Districts in Ontario Ontario Planning Act, R.S.O. 1990, c. P.13 Local Planning Appeals Tribunal | Environmental and Land Tribunals Ontario Archives of Ontario Built Heritage News Ontario Heritage Act + More Blog Architectural Conservancy of Ontario Ontario Heritage Trust Ontario Association of Architects DOCOMOMO Ontario