Who sets the design guidelines for Heritage Conservation Districts?

The City’s Heritage Preservation Services policies offer standardized guidelines and procedures for preserving the heritage character of unique neighbourhoods across the city by declaring them Heritage Conservation Districts. It is intended that local residents themselves determine priorities for their HCDs, with the city administering a consistent process for studying and designating districts to ensure a higher standard of heritage conservation. The city provides their policies on their website: http://www.toronto.ca/heritage-preservation/heritage_districts.htm