1. The document describes the planning and development of a housing block called "Greenest of the green" in Helsinki, Finland that aims to maximize biodiversity and sustainability. 2. Extensive planning involved designers, engineers and researchers to design green roofs, facades and balconies planted with native Finnish species to support pollinators and biodiversity. 3. An unexpected issue during construction was that the building foundations could not support the heavy substrates and plants as originally planned, requiring redesign with lighter designs using more smaller trees and bushes.