From the outside, it looks like a clean, modern social housing block. You can tell it’s new — there are 84 shiny solar panels on the roof and the fresh paint has barely dried on the walls. But it’s how this 56-dwelling building in Barcelona, complete with ground floor nursery, was designed and built that really matters.  “Our software is our superpower,” says Lucas Carné, co-founder of 011h, a construction tech firm, as he describes how his company has designed digital tools to help architects plan buildings like this one. “We use a lot of prefab,” he adds. “That reduces…

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