When heritage assets exist in a concentrated grouping, as identified through a local area plan, then all residential properties on the identified streetscape are eligible for protections. Calgary’s heritage area policy applies to residential block-faces. A block-face is one side of a street between two street corners or other geographic boundaries. If 25% heritage assets are identified on a block face: all new construction is discretionary, requiring a design review, which applies to all properties (including non-heritage). If 50% heritage assets exist on a block face: mandatory architectural controls and regulations could apply to all properties; involving the creation of a “direct control district” with owner-consent; the highest level of control offered.