St. Martin Parish presents a cash-flow-versus-demand tension. Zillow's county median home value is $177,823, measured median asking rent is $1,238 monthly, producing a reported gross yield of 8.35% before costs. That merits investigation for an income-oriented purchase, not reliance on appreciation. Hurricane exposure and the county-level scope require conservative diligence on rent, insurance, and exit conditions.
FHFA's repeat-transaction HPI rose 3.73%. It is an appreciation index, not a home value, and its vintage and method must not be averaged with Zillow's county observation. HUD's two-bedroom FMR is $1,019: a payment standard, not market rent. The effective property-tax rate is 0.44%, with median annual tax of $725. Gross yield excludes insurance, repairs, vacancy, financing, utilities, and net operating income, so net yield and debt-service coverage cannot be underwritten.
Demand evidence is mixed. QCEW covered employment declined 0.12%, while Realtor.com MLS median listing price rose 20.62% and active listings rose 18.72%. These are asking-price and visible-supply measures, not closed sales or proof of demand; shorter marketing time and reported price reductions show seller concessions in the visible market. Net migration was an outflow of 56 households, but inbound movers' average AGI exceeded outbound movers' by $2,307, supporting income quality without proving population growth. Investors accounted for 23 of 397 purchase mortgages, or 5.79%: competition exists but is not dominant in this purchase record. QCEW workplace jobs are not resident employment.
Underwriting should center on hurricane loss and operating frictions. The modeled annual building-value loss ratio is 0.38%, but no insurance cost, deductibles, flood or wind coverage, claims history, elevation, or property-level hazard result is supplied; the ratio cannot become a property expense. Next checks are rent comps and leases, parcel taxes, insurance quotes, condition, utilities, vacancy, and financing. Missing closed-sale comps, rent growth, turnover, and property-level cash flow prevent conclusions about stabilized NOI, exit liquidity, or leverage capacity.