Milan, a metropolis in Lombardy in northern Italy, is known worldwide as a center for fashion and design. The city is also the seat of the Milan Stock Exchange and the financial industry and offers many fine restaurants and expensive boutiques. The Gothic Milan Cathedral and the Santa Maria delle Grazie monastery, in which Leonardo da Vinci's mural “The Last Supper” is located, are expressions of the centuries-old art and cultural history of the city.
The project was designed as part of the rehabilitation of the historic district of Milan between Via De Castillia and Confalonieri. It consists of two residential towers of which the largest is 26 floors and 110 meters high (called Torre E) and the smaller tower is 18 floors and 76 meters high (called Torre D). It contains 400 condominium units priced from 3,000 Euro per square metre and higher.
It is called Bosco Verticale because each tower houses trees between three and six meters which help mitigate smog and produce oxygen. It is also used to moderate temperatures in the building in the winter and summer. The plants also attenuate noise. The design was tested in a wind tunnel to ensure the trees would not topple from gusts of wind. Botanists and horticulturalists were consulted by the engineering team to ensure that the structure could bear the imposed by the plants. The steel-reinforced concrete balconies are designed to be 28 cm thick, with 1.30 metre parapets.