Census housing-stock context for an area. Perfect for: 'housing stock for an area', 'how old are the homes / median year built', 'owner vs renter share', 'housing units and vacancy for a place'. Returns cited ACS housing-stock characteristics (units, age, tenure, vacancy) for the resolved county/area. National. Area-level context, not a parcel record. Charge-free when the housing-stock lookup fails.