The Doctrine--Practice Gap in Real Estate Appraisal

A Structured Account of Functions, Boundaries, and Tensions

Abstract

Real estate appraisal occupies a position of significant public interest, yet its official doctrine---centered on opinions of market value under past and current conditions---sits in growing tension with how appraisal products are actually used in contemporary financial pipelines. This article builds that case in five stages, each paired with an explicit, queryable Prolog knowledge base: the first two establish the social and economic functions appraisal serves; the third identifies its primary end product, an opinion of market value; and the fourth examines appraisal's temporal and methodological orientation relative to quantitative and financial forecasting, together with the regulatory boundary that separates them. These converge on the central claim of the fifth: in mortgage lending, market value scaled by a loan-to-value ratio functions as an implicit proxy for future foreclosure value---a forward-looking use the present-value doctrine does not acknowledge. Many appraisers, unaware of this collateral-valuation role, do not treat market value with the caution toward future value trends it warrants — an issue this account is meant to expose and invite further work on.