Glossary

Highest and Best Use as Improved

Also known as: HBU as Improved

The appraisal analysis of the most profitable legally permissible, physically possible, and financially feasible use of a site given its existing improvements, testing whether continued use of the current building, its renovation, an addition, or demolition and redevelopment produces the greatest supportable value.

As-improved analysis differs from as-vacant analysis in a critical respect: it must weigh the cost of demolishing or altering the existing structure against the value the alternative use would create, meaning a use that would clearly be highest and best if the site were vacant may not be highest and best as improved once demolition costs, any remaining economic life in the existing improvements, and the value contribution of continuing the current use are netted against the alternative. This produces one of the most consequential threshold judgments in a repositioning or value-add underwriting: if the value of the site under its optimal as-vacant use, net of demolition and carrying costs, exceeds the value of the property in its current improved state, the existing improvements are properly characterized as an interim use rather than the true highest and best use, and rational ownership behavior points toward redevelopment once the interim use's remaining economic contribution is exhausted — a conclusion appraisers reach cautiously, since overstating obsolescence to justify redevelopment, or understating it to preserve income-producing status, materially skews the resulting valuation. This as-improved test is also the standard framework for evaluating whether a building's current use represents a legal nonconforming condition worth preserving versus a value-destructive constraint better resolved through redevelopment to a conforming use.