This briefing develops a framework to measure commercial externalities in property valuation, suggesting improved accuracy and transparency.
Purpose This practice briefing develops a coherent framework for identifying and measuring commercial and industrial externalities, addressing the lack of standardised approaches in valuation practice. Design/methodology/approach The briefing synthesises evidence from environmental economics, urban planning and real estate finance to construct a five-category typology and translate empirical distance decay patterns into GIS-ready measurement strategies. Findings Commercial externalities exhibit predictable spatial signatures that can be measured consistently using proximity-based indicators. When organised into a structured typology, these patterns provide a basis for integrating externalities into valuation and investment analysis. Practical implications The framework enables practitioners to replace subjective adjustments with transparent, replicable spatial measures, improving valuation defensibility, underwriting accuracy and communication among market participants. Originality/value To our knowledge this is the first unified, practitioner-oriented framework that consolidates empirical externality research into a usable structure tailored to commercial valuation and GIS-based analysis.
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James E. Larsen (2026) studied this question.
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