Millennium Greens is the story of the transformation of the old flour factory, the Millennium Mills, into an innovative research laboratory centre. The building is situated on the northwest coast of the Silvertown Sensory Scapes, an innovative and experimental community park project. The standout feature is the heliotropic arrangement of algae photobioreactor tubes that flow out from the roof through the southern façade. This design optimises solar energy absorption for the algae inside while creating a visually captivating composition and serving as an integrated environmental strategy. The project aims to combine architecture, sustainability, and scientific exploration by harnessing the potential of adaptive re-use.