market_type,property_type,median_error_pct,p80_error_pct,notes
Suburban tract,Single-family,0.02-0.04,0.07-0.10,Fresh comps; similar floor plans
Urban mixed,Townhome/Condo,0.03-0.06,0.10-0.14,HOA & amenity differences
Rural low-turnover,Single-family,0.05-0.09,0.15-0.20,"Sparse, older comps"
Unique/renovated,Custom SFR,0.06-0.10,0.18-0.25,Upgrades not in public data