Highest and best use is the cornerstone concept of commercial real estate valuation. It's the use of a property — among all the realistic alternatives — that produces the greatest land value. Every appraisal under USPAP and CUSPAP must explicitly identify the highest and best use before proceeding to the value conclusion, because value depends entirely on use.
The four tests are universal: the use must be legally permissible (allowed by zoning and other regulations), physically possible (the site can support it), financially feasible (it would generate sufficient income to justify development), and maximally productive (it produces the highest residual land value among the feasible alternatives). A use that fails any one of these tests cannot be the highest and best use, no matter how attractive it might seem.
Highest and best use can differ between the property as vacant and the property as improved. A 1970s low-rise office building on a downtown lot might be approaching the end of its economic life — the highest and best use 'as vacant' could be a new high-rise tower, while the highest and best use 'as improved' is to continue operating the existing building until demolition becomes economically optimal. This split analysis is critical to understanding the value of older properties on developable sites.
Practical highest and best use analysis is harder than it sounds because the financially feasible test requires real underwriting of competing uses. Could a hotel produce more land value than an apartment? Could a mid-rise produce more than a high-rise after construction costs and approval timing? The answer is rarely obvious without running the numbers — which is why highest and best use is the part of an appraisal where experienced practitioners earn their fees.
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