fn classify_bldg(
tags: &Tags,
amenities: &[Amenity],
levels: f64,
ground_area_sq_meters: f64,
rng: &mut XorShiftRng
) -> BuildingType
fn classify_bldg(
tags: &Tags,
amenities: &[Amenity],
levels: f64,
ground_area_sq_meters: f64,
rng: &mut XorShiftRng
) -> BuildingType