The document discusses how the built office environment can impact employee health, productivity and sustainability. It provides examples from Park 20|20, a development project in Europe designed by William McDonough + Partners to high environmental standards. Key aspects discussed include using non-toxic and sustainably-sourced materials to improve indoor air quality, maximizing access to daylight, biophilic design principles, and optimizing acoustics, thermal comfort and workspace layout to enhance occupant well-being and productivity. Research at the development found that introducing plants helped filter toxins from the indoor air. The project aims to advance understanding of how building design can positively influence occupants.