St. Croix County presents a narrow tradeoff: measured market rent supports a 4.89% gross yield on a $421,704 median Zillow home, while inland-flood exposure and property taxes leave limited room for unmodeled costs. The thesis is selective rather than broad: investigate properties with verifiable rents, flood and insurance terms, and tax records; be cautious if the case depends on appreciation or gross yield alone. Zillow’s price rose 1.17%, while FHFA’s repeat-transaction index rose 3.96%. These are different measures and supplied vintages: FHFA is not a home value and should not be averaged with Zillow.
Published median asking rent is $1,717 per month, or 100.5% of HUD’s $1,709 two-bedroom Fair Market Rent; FMR is a payment standard, not asking-rent evidence. The supplied gross yield is before costs, not a net return. Median annual property tax is $4,420, but insurance, flood deductibles, repairs, vacancy, management and financing are not published. That missing expense set prevents a net-cash-flow or debt-service conclusion. The rent-to-price relationship therefore supports screening, not a completed underwriting case.
Demand and competition evidence is mixed. Tax-return migration was net positive at 61 households, while incoming average AGI exceeded outgoing average AGI by $18,420. QCEW covered employment grew 1.05%, and the average weekly wage was $1,093, up 2.82%. Trade, transportation, and utilities was the largest disclosed private supersector; QCEW is workplace employment, not resident employment or a forecast. Realtor.com recorded 234 active listings, down 20%, indicating less visible supply, but this is MLS evidence rather than proof of buyer demand. Investor purchase mortgages were 56 of 1,245 total purchases, or 4.5%, so competition is present but not dominant in this record.
Next checks are parcel-level inland-flood mapping, elevation, insurance availability and deductibles, plus leases, achieved rents, taxes and full operating expenses. The modeled annual building-value loss is 0.11%, but that county-level ratio does not price a specific parcel or its insurance cost. Vacancy, cap rate, financing terms, sale comps and property condition are not published; without them, an underwriter cannot validate stabilized cash flow, market value or flood-adjusted returns. The county evidence also does not establish whether a given parcel sits in the modeled hazard footprint.