The sales comparison approach is used and relied upon within this assignment to conclude credible results. In this market, residential properties are purchased primarily for owner-user utility and the sales comparison approach best reflects this market motivation.
The overall quality of the data is very good. I have 3 recent sales that require no market condition adjustments and one of the sales is one parcel north of the subject on the same cul-de-sac street.
The weakness of this approach is the available listings to consider. The most applicable listing has had significant renovations ($2,000,000 per the broker). Despite this weakness, the 3 closed sales provide a high-confidence indicator of value. Furthermore, I've tested the adjustment scheme using sensitivity analysis which includes an outside-the-grid sale; the analysis indicates that the adjustment scheme, as applied, explains the value differences to within 4% for any one sale, and on average, to within 1%.
The cost approach is not necessary to conclude credible results; however, it is required by my client and I have therefore completed it. The cost approach is applicable for this assignment, as buyers of high-end custom homes do consider purchasing a site and building a new home within this market. The overall data for site value is above average: I have two prior sales of vacant sites within the subject's gated community, one of which has been relisted and is currently active. The additional sales outside of the development are generally in support of the concluded site value.
A weakness of this approach is the replacement-cost data; I've used a national costing service which relies on high-end Q3/Q2 blended $/sf; the subject's custom quality may not be adequately captured in this analysis. Despite this weakness, the cost approach's indicated value is within 2% of the indicated value by sales comparison approach. I gave the cost approach secondary consideration due to the relative inferior quality of the data vs. the sales comparison approach.
The income approach is not necessary to conclude credible results and is not required by my client. The typical buyer and seller in this market is an owner-occupant and income revenue is not a significant market-participant motivation. Therefore, the income approach is not completed.