SAN FRANCISCO, Oct. 14, 2025 /PRNewswire/ — Class 3 Technologies (Class 3), a startup pioneering the next-generation of climate risk and resilience modeling for the built environment, today announces the close of its $3.5M seed round led by Powerhouse Ventures alongside Sustainable Future Ventures and Tailwind Futures. Spun out of the global engineering and built environment consultancy Arup, Class 3 exits stealth with Iris — a first-of-its-kind platform delivering actionable, building-level insights to help organizations quantify and manage the growing threat of climate-driven disasters.