Walworth County presents a value-to-rent tension: Zillow reported a $411,759 county median home value in June 2026, versus $1,333 monthly median asking rent and a supplied 3.88% gross yield before expenses. Cash-flow underwriting requires asset-level cost and rent verification rather than treating that headline yield as cash flow. Zillow and annual FHFA HPI use different vintages and methods and cannot be combined.
The cost screen is central. FHFA’s 2025 repeat-transaction index rose 5.76% year over year; it provides direction evidence, not a dollar home value or sale-price measure. HUD’s two-bedroom FMR is $1,206 monthly, a payment standard rather than an asking-rent estimate, and cannot replace published market rent. The 1.33% effective property-tax rate compresses gross yield before insurance, maintenance, vacancy, debt service and flood costs. Missing asset expenses, lease terms and achieved rents prevent a net-yield conclusion.
Realtor.com’s visible active inventory declined year over year, while median marketing time was 51 days and 15.25% of listings had price reductions. These are MLS asking-price, supply and marketing-time measures, not closed sales or proof of buyer demand. Migration was a 24-household net outflow, though inbound movers’ average income exceeded outbound movers’ by $23,658; this mix does not establish renter demand. Investor participation was 8.14% of 1,180 purchases, a defined but unexplained non-owner-occupant presence.
Inland flood is the key risk. Modeled climate loss equals 0.09% of building value per year, a county-level expectation requiring parcel flood exposure, insurance availability and deductible testing, not conversion into a property loss estimate. QCEW labor evidence measures annual covered jobs at county workplaces, not resident employment or a forecast; Manufacturing is the largest disclosed private supersector, not the whole economy. Closed-sale comparables, submarket rent concessions, operating statements, flood records and tax bills remain needed. Their absence prevents defensible net-income, liquidity and site-risk conclusions.