Which of the following is a method of estimating depreciation?

The Quantity Survey Method is a detailed approach for estimating depreciation that entails a comprehensive analysis of all components of a property. This method involves calculating the replacement cost of each element, determining its useful life, and then calculating depreciation accordingly. It is particularly thorough, as it accounts for factors such as physical deterioration, functional obsolescence, and external obsolescence, allowing for a more precise evaluation of a property's worth over time.

In contrast, the other methods mentioned serve different purposes and approaches in real estate valuation. For example, the Sales Comparison Method focuses on comparing similar properties to determine value based on recent sale prices, while the Overall Cost Method involves estimating the total cost of a property including land and improvements. The Market Demand Method assesses property value based on supply and demand dynamics but does not specifically address depreciation directly. Thus, the Quantity Survey Method stands out as the most focused and informative technique for estimating depreciation accurately.