In May, German architectural firm Ingenhoven Architects broke ground on Kö-Bogen II, a sustainable mixed-use development envisioned as the “new green heart” of Düsseldorf, Germany. Designed to visually extend the adjoining Hofgarten park into the inner city, Kö-Bogen II wraps the sloping facades of its two buildings with hornbeam hedges that total nearly 5 miles in length. The hedges and turfed rooftop spaces will also help purify the air and combat the city’s heat island effect by providing a cooling microclimate.

trapezoid-shaped building with sloping green roof turning orange in the fall

Located at Gustaf-Gründgens-Platz, Kö-Bogen II will serve as a commercial and office complex covering 42,000 square meters of gross floor area offering retail, restaurants, office space, local recreation and a five-story underground parking garage with 670 spaces. The development comprises a five-story trapezoid-shaped main building and a smaller triangular building that cluster around a valley-like plaza. The sloping facades, which will be planted with hornbeam hedges, open up the plaza to views of the iconic Dreischeibenhaus and the Düsseldorf Theater nearby. The architects will also be refurbishing the roof, facade and public areas of the Düsseldorf Theater.

trapezoid-shaped building with sloping green roof in the summer
trapezoid-shaped building with sloping green roof covered in snow in the winter

“In order to do justice to the overall urban design situation, the design of Kö-Bogen II deliberately avoids a classical block-edged development such as that along the Schadowstrasse shopping street,” the architects explained in a press release. “In addition, the idea of green architecture has been applied systematically, thus distinguishing the development from conventional architectural solutions.”

Related: A rainforest-like green heart grows within Singapore’s Marina One

aerial view of trapezoid-shaped building with sloping green roof at night
aerial view of trapezoid-shaped building with sloping green roof during the day

Ascending to a building height of 27 meters, the hornbeam hedges will offer seasonal interest by changing color throughout the year. The turfed surfaces planted on the triangular building’s sloped facades will be accessible to passersby, who can use the space as an open lawn for rest and relaxation. Kö-Bogen II is slated to open in the spring of 2020.

+ Ingenhoven Architects

Images via CADMAN