Underneath the Manhattan Bridge at 74 Pike Slip sits the DSNY Special Waste drop-off, a collection site for hazardous chemicals, loose concrete aggregate, and other hard to recycle materials. This current private space exists geographically within the area, but it does not exist within the regional community. This results in a parasitic relationship between neighborhood, site, environment, and existing structures of power. Our proposal is to take the existing materials of the site that are normally difficult to reuse and transform them into a composite material that will allow the undercommons of this community to profit and grow. The primary output of this composite material will be as porous pavers along the East River Greenway nearby to help mitigate the massive flood risk to the neighboring communities. Underneath these pavers will exist microalgae collection chambers in order to extract the cyanobacteria within algae to use as a binding agent within our composite material, creating a bio-cement that is not only stronger than current concrete-based building materials but also eliminates most, if not all, of the carbon emissions associated with concrete production.