Newtown voters have endorsed considering limited mixed-use development to the Fairfield Hills Master Plan.  Commercial proposals could include a housing component, provided that the residential portion is limited to no more than two of the existing buildings, and that the renovation is consistent with the architectural vision for the property. First Selectman Dan Rosenthal says the referendum is not a de facto authorize housing at the former psychiatric hospital campus.  He notes that the town reserves the right to reject any residential development proposed if it is not approved by several local boards and agencies.