Vegetated roofs are a valuable amenity in urban living. Providing a bit of nature, be it a small extensive garden roof or an intensive roof deck with trees and amenities for entertaining, can offer significant and quantifiable benefits to quality of our daily lives, contribute to reducing stormwater and utility costs, mitigate urban heat island effect, and raise real estate values. 

https://www.nytimes.com/2018/06/26/realestate/the-living-roof-takes-root.html

photography credit: NY Times