Entrances are not interchangeable
A street entrance carries pedestrian soil, weather and the building's public presentation. A carpark entrance carries vehicle-borne grit, oil residue and a heavier load in wet weather because people arrive with wet footwear rather than wet umbrellas. A service entrance carries trolleys, deliveries and staff. Each produces a different kind of soil and each is judged by a different audience, so a single specification serves none of them well.
Establishing which is which takes a walk at the right time of day rather than a look at a floor plan. The entrance that appears secondary on paper is frequently the one that most people actually use, particularly where the carpark is on the opposite side from the street frontage. That observation changes the weighting and it is usually worth more than any refinement to the method.
