Rainbow Valley retrospective appraisal work becomes more reliable when the historical competitive set is defined before the search radius expands. Slope, drainage, floodplain, and improvement placement can make gross site size a poor comparison metric. The analysis should be built from evidence available around the earlier effective date and should resist hindsight from later market events.
A retrospective appraisal should identify what the neighborhood, competing inventory, access, and development pattern looked like on the effective date. Later growth can explain how the area changed, but it should not be used as if historical buyers already had those choices. For Rainbow Valley, the appraisal should consider desert terrain only when it changes the subject's competitive position.
Looking back to the earlier market, slope, drainage, floodplain, and improvement placement can make gross site size a poor comparison metric. The analysis should test the feature against market evidence from the period being reconstructed.
For the stated retrospective date, later planned communities, road projects, and commercial development should not be treated as existing influences if they postdate the valuation. The useful evidence is whatever shows how that characteristic affected substitution on the stated prior date.
Market movement can help explain the period, but a retrospective value should not be produced by mechanically applying a citywide appreciation rate to today's value. The subject still needs historical comparable evidence from its actual segment.
Historical market data is strongest when paired with records that show what the property and neighborhood actually looked like on the effective date. Later information can be considered as context, but it should not replace evidence from the prior market.
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