Mason County presents a valuation-reconciliation case, suited to buyers willing to verify parcel-level rents, insurance, and sale comparables, and requiring caution from anyone underwriting a single appreciation trend. In Zillow’s June 2026 county observation, the median home value was $173,419, down 5.75% year over year. FHFA’s 2025 annual repeat-transaction HPI instead rose 2.60%. These are different methods and vintages: the FHFA index is not a home value, and neither measure resolves current executable value.
Income production is the central missing input. Measured market asking rent is not published, so gross yield cannot be computed. The HUD two-bedroom Fair Market Rent is a payment standard rather than an asking-rent estimate and cannot fill that gap. Carrying-cost evidence is also partial: the supplied effective property-tax rate is 0.65%. Assessed-value treatment, insurance, maintenance, vacancy, and financing terms are not supplied, preventing a net-cost conclusion.
The supplied Realtor.com MLS evidence is a thin visible listing set—18 active listings—not closed-sale evidence. The 59-day median marketing time and 14.45% price-reduced share show marketing friction and concessions at listed properties, but do not independently establish buyer demand or sale prices. Tax-return migration was positive, while average AGI for in-movers exceeded that of out-movers by a calculated $3,498. Investors made 7 of 134 purchases, or 5.22%, so non-owner participation is measurable but not the principal observed purchase channel.
Inland flood is the dominant hazard, and modeled climate loss equals 0.15% of building value expected lost per year; it is a model, not a parcel claim history or insurance quote. The annual QCEW count is 7,868 covered jobs at county workplaces, down 0.53%, rather than resident employment, unemployment, or a forecast. Trade, transportation, and utilities is the largest disclosed private supersector, not the whole economy. Next checks are parcel flood zone, insurance terms, property condition, leases, assessed value, and closed-sale comparables; their absence prevents a confident income, net-carry, or exit-value conclusion.