Terrassa

Terrassa monetises industrial leftovers better than most larger cities. The city has 233,362 residents at 302 metres, yet municipal observatory figures also show EUR 6.099 billion of local GDP, 5,421 employer companies, and 8,903 university students spread through the street grid rather than sealed inside a suburban campus.

The official story still starts with Catalan industry and modernist mills. The hidden business is conversion. Terrassa sits in Barcelona's wider economic orbit, but it does not behave like a dormitory suburb. The city says four universities, six schools, one faculty, and two university hospitals teach around 10,000 students there, with 68 research groups active in the current academic year. Aeronautics, optics, film and audiovisual studies, occupational therapy, and textile engineering all sit inside the same urban fabric. Terrassa earns from the traffic between those specialities as much as from any one speciality itself.

The clearest example is the Parc Audiovisual de Catalunya. Terrassa repurposed the former anti-tuberculosis Hospital del Torax, a 1,200-bed complex opened in 1952, into a production site with film stages, offices, a business cluster of more than 40 companies, and the Filmoteca de Catalunya's conservation centre. The city's Moare festival makes the strategy explicit by joining fashion and audiovisual work across five recovered industrial venues. Terrassa is not preserving industrial heritage as scenery. It keeps turning mills, hospitals, and training institutions into new economic surfaces that attract more firms, teachers, crews, and students.

That is adaptive radiation: one industrial lineage branching into engineering, health, design, and media instead of dying with its original product cycle. It is also mutualism, because universities, employers, hospitals, and municipal infrastructure feed each other's demand for talent, contracts, and space. And it is niche construction: Terrassa repeatedly rebuilds inherited structures so new sectors can colonize them. The closest organism is mycorrhizal fungi, whose strength comes from the network linking many hosts rather than from a single visible trunk. Terrassa works the same way, moving knowledge, people, and opportunity between connected institutions.