Median price per square foot for James Island is quoted around $495. Can I just multiply that by my square footage?

A quoted price-per-square-foot figure for James Island cannot simply be multiplied by a home's square footage, since that shortcut ignores lot size, condition and exactly which sales fed into the average. Two James Island homes of the same size on different streets can carry very different true values. Brian Beatty builds a comparison from actual comparable closings rather than applying a blended per-square-foot number to any one property.