The green roofs on the curvey building are divided into parcels that are separated by parapets. On top of a concrete roof, the green roof system begins its build-up with three layers of waterproofing. The green roof system comprises 2" of sandy soil topped with the same pervious paver blocks used at grade, and overlain with a uniform grass sod. In their appearance and composition, the green roofs are identical to the grassy pedestrian and parking areas at grade.