There is a particular sound a city makes when it walks past a building it dislikes. Shoes quicken. Conversations resume a few metres later. For most of the nineties, Halle Nord produced that sound every morning. The nine-storey registry tower, poured in 1971 by the municipal works department rather than an architect of any renown, was grey in the way wet newspaper is grey.1Footnote 1: The works department credited no individual designer. The drawings are signed only with a stamp: Hochbauamt, Abteilung II.
Then the money for demolition did not arrive, and something stranger did: use.
The building’s plan is almost insultingly simple. A service core sits off-centre, pushed east so that the western rooms run the full depth of the floor plate. Each floor has twelve identical window bays. Each bay is 2.4 metres wide, which happens to be the width of a desk plus a chair plus a person standing behind that chair.2Footnote 2: The 2.4-metre module recurs across Swiss administrative buildings of the period; it was a plywood sheet dimension before it was an architectural one. When the registry left, that module turned out to fit a seamstress, a notary, a one-room radio station, and a man who repairs accordions.
What the building has, and what its replacement never would have, is weight. The slabs are 320 millimetres thick. You can stand on the sixth floor during a tram strike and hear nothing. The concrete holds the morning cold until noon and gives it back after dark, a slow thermal breath that the newer glass buildings along the river cannot afford to take.
In 2019 the city, with no ceremony, painted the plinth red. The gesture cost almost nothing and changed everything about how the tower meets the pavement. A grey building that touches the ground grey looks like it fell there. A grey building standing on a red band looks like it was placed.3Footnote 3: The colour is close to the federal red used on signage, though the painter insists it was simply what the depot had in stock.
Architects like to say that brutalism is honest. That is marketing. What Halle Nord actually is, is patient. It did not argue with the decades that despised it. It waited, structurally over-specified, for the city to need a cheap, quiet, cold-holding box in the middle of town. It is now fully let, and the registry wants to move back in. There is no room.
The lesson is not that we should pour more concrete. It is that a building worth keeping is often one that does less than it could, with more material than it needs. Capacity is a kind of generosity. Halle Nord has been generous for fifty-five years, and it has only just been thanked.