In a rapidly appreciating market, a valuer finds comparable sales from 4 months ago averaging $650,000, while more recent sales from 1 month ago average $680,000. For a current valuation, what adjustment approach would be most appropriate?

Option A: Use the older sales without adjustment as they provide more data

Using older sales without adjustment ignores the significant market appreciation that has occurred. The $30,000 increase from $650,000 to $680,000 over 3 months represents substantial market movement that must be accounted for. Failing to adjust would result in an undervaluation that doesn't reflect current market conditions, potentially disadvantaging the property owner and providing inaccurate market information.

Option C: Average all sales regardless of timing

Averaging all sales regardless of timing fails to account for the time-sensitive nature of market appreciation. This approach would dilute the impact of recent market movements and provide a valuation that falls between historical and current values, rather than reflecting true current market value. The resulting average would understate the property's current worth in an appreciating market.

Option D: Only use sales from the last month and ignore older sales

Relying solely on recent sales limits the available data pool, potentially reducing the reliability of the valuation. While recent sales are valuable, using only one month's data may not provide sufficient comparable evidence. Professional valuation practice requires using all relevant comparable sales with appropriate adjustments rather than arbitrarily excluding useful data based solely on age.