“Where the nature of the development is such that there are no (or limited) transactions to use for the comparative method, the residual method provides an alternative valuation approach. However, even limited analysis of comparable sales can provide a useful check as to the reasonableness of a residual valuation.”
“The residual method requires the input of a large amount of data, which is rarely absolute or precise, coupled with making a large number of assumptions. Small changes in any of the inputs can cumulatively lead to a large change in the land value. Some of these inputs can be assessed with reasonable objectivity, but others present great difficulty. For example, the profit margin, or return required, varies dependent upon whether the client is a developer, a contractor, an owner occupier, an investor or a lender, as well as with the passage of time and the risks associated with the development.”