St. Clair County offers a measured rental entry point but a narrow pre-cost spread: Zillow's 2026-06 median home value is $264,049 and median asking rent is $1,054, with supplied gross yield of 4.79%. Rent growth of 4.5% trails price growth of 4.7%. That supports a selective thesis, not a countywide buy signal. Investors should investigate property-level rent, vacancy, condition, and insurance; buyers relying on appreciation or thin cash flow should be cautious.
FHFA's 2025 annual repeat-transaction HPI rose 4.82%; it is an appreciation index, not a home value, and should remain separate from Zillow's observation rather than be averaged with it. HUD's two-bedroom FMR is $1,411, a payment standard rather than asking-rent evidence. The effective property-tax rate is 1.14%, with median annual tax of $2,562. Those carrying costs press on the gross yield before insurance, repairs, vacancy, management, or financing, none of which is published.
Realtor.com reports visible active supply up 13.51%; marketing time and price reductions are listing-market signals, not closed-sale proof. QCEW covered employment fell 1.30%, while average weekly covered wage is $1,117, up 4.30%; the largest disclosed private supersector, trade, transportation, and utilities, is only one slice of the economy. Tax-return flows nearly balance, with net migration of 23, while inbound average AGI exceeds outbound by $2,066.
Investor participation is limited in the supplied purchase data: non-occupant purchase mortgages are 3.74% of 1,820 purchases, so investor competition is not established as dominant. The modeled annual building-value loss ratio is 0.11%, and inland flood is the dominant hazard; that ratio is not an insurance quote or a property-level flood determination. Next checks are parcel flood zone and elevation, insurance and deductible, rent roll and concessions, vacancy and expenses, financing, and closed-sale comps. Missing insurance, operating statements, closed sales, and property-level hazard data prevent a net yield, stress-tested cash flow, or demand conclusion.