Purple

Of National Architectural or Historical Importance.

Blue

Of Major Architectural or Historical Importance.

Green

Of Local Architectual or Historical importance

Pink / Red

Of Local or Major Architectual or Historical importance that has been detrimentally altered (but if properly restored, could be upgraded to Blue or Green)

Yellow / Gold

Contibutes to the character of the District

Orange / Grey

Unrated 20th/21st-century construction

Brown / Grey

Objectionable or of no Architectural or Historical importance