Print this page Property Owners Average Changes for Residential Properties Regional Municipality of Durham Region #13 Municipality - click below --> DURHAM REGION Municipality Your 2012 Property Assessment Notice shows the assessed value of your property based on a January 1, 2012 valuation date. For the 2013 tax year, the average assessment of residential properties in your municipality/local taxing authority changed by: . Residential property types may include single family, semi-detached, condominiums, and recreational properties. ** This percentage reflects the overall change to all residential properties in your municipality/local taxing authority, although individual property types may have changed at different rates.