Following the visitor route rather than the floor plan
The front-of-house zone is defined by where visitors go, not by where the fit-out changes. That usually means the entry, the reception desk and its surrounds, the seating, the corridor to the meeting rooms, the meeting rooms themselves and the washroom visitors are directed to. It may also include a kitchen point if refreshments are offered, and a stretch of glass that everyone walks past.
Walking that route is the fastest way to define the zone accurately. It regularly turns out to include something the floor plan would not suggest, such as a corridor with a photocopier that visitors pass on the way to a meeting room, or a glass partition that dominates the view from the seating. Those are the surfaces that carry the impression, and they belong on the higher frequency.
