The top roofs are described as extensive green roofs (100-150mm substrate) which means they can be seeded with native species and offer a precious undisturbed habitat for invertebrates and the rare black redstart whilst also contributing to the stormwater attenuation.  

The use of street trees in the scheme sees the tree canopy rise by more than 10%, and again, by using SuDS tree pits, stormwater is filtered and attenuated. The green wall faces the wall of the offices and provides further habitat and will develop into a complex vertical structure.