Kalkbreite
A whole piece of city — built on top of a working tram depot.
City
Zürich
Year
2014
Height
~7 stories
Homes
~97
Residents
~250
Architect
Müller Sigrist
Tenure
Cooperative
Site
Over a tram depot
The Genossenschaft Kalkbreite convinced Zurich to lease it the air rights over a tram depot, then built a full perimeter block above the sheds: roughly 97 apartments and 250 residents upstairs, with shops, a cinema, restaurants and offices — on the order of 200 workplaces — at the street. The courtyard is lifted one level onto the depot roof: a planted garden of about 2,500 m², open to the public by day. Residents get roof terraces above; the neighborhood gets a green square it never had.
What to steal: the mix. Incomes are deliberately mixed, apartment types run from small studios to a Großhaushalt — a cluster household with a staffed kitchen — and the ground floor pays real rent. Kalkbreite is the proof that a co-op courtyard block can sit on the hardest site in the city and still pencil.
Lessons for Berkeley
- Impossible sites are opportunities: air rights over transit and public yards are land nobody else is bidding on.
- A raised courtyard can be public by day and residential by feel — Berkeley's corridor lots could do the same over parking or retail depth.
- Two hundred workplaces under the homes is what makes the street safe and the pro forma work — retail is structure, not amenity.
- Mixed incomes by design, from studios to a cluster household, is the anti-monoculture insurance.
- The city leased, the co-op built. Berkeley owns parcels; the mechanism exists.
Sources: Genossenschaft Kalkbreite publications — kalkbreite.net. Figures (~97 homes, ~250 residents, ~2,500 m² garden, ~200 jobs) are the cooperative's published approximations.
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