The selected price and rent are metro indexes, not a property quote. The property-tax rate is a population-weighted average across mapped counties with direct ACS evidence. Freddie Mac PMMS is a national conforming-loan average for a defined application set, not the rate a lender will offer you.
Insurance and maintenance begin as standardized assumptions because no free national property-level source supports precise defaults. HOA, PMI, utilities, renovation, tax deductions and capital-gains taxes are omitted. Add them to your interpretation or replace the inputs with a property-specific underwriting model.