Two residential towers in Milan, Italy are host to a "vertical forest" of 900 trees (3, 6 or 9 meters in height), along with over 20,000 plants from a wide range of shrubs and plants distributed according to the sun exposure of the fa?????ades. The project designer is Stefano Boeri Architetti (SBA), www.stefanoboeriarchitetti.net, a Milan architectural firm, which also has offices in Shanghai and Tirana.

The vertical forest is a model for a sustainable residential building. Each of the vertical tower forests would cover an area of 7,000 sq. meters if on terra firma. This vertical kind of living avoids yet more urban sprawl of family houses and buildings. If the towers were single-family dwellings they would cover about 75,000 sq. meters

The green towers are also a means of metropolitan reforestation, contributing to the regeneration of the environment and bringing greater biodiversity to the city. These vertical forests are essentially microclimates that produce humidity, absorb CO2 and dust particles and produces oxygen. The trees offer shade for residents and muffle the noises inherent in the urban environment. It also creates an environment that attracts birds and insects.