A property sub-class is a more specific categorization within a main property class, allowing for differentiated tax treatment. For example, within the residential class, sub-classes might distinguish single-family homes from multi-unit apartments, or new construction from older buildings. Within commercial, sub-classes might separate office buildings from retail or parking lots. Sub-classes enable municipalities to apply different tax rates to different property types within the same general category. This provides flexibility in tax policy, such as offering lower rates to encourage certain types of development or providing relief to specific property types.