Project Description


A circular carbon bank

Nearly 80 meters tall, TRÆ is the first wooden building of its’ size in Denmark. Apart from the wooden load bearing constructions, the building design is based on creating a carbon bank and reused building materials: windows, upcycled wooden floors, and reused facade materials.


The vision behind the three connecting buildings in TRÆ (tree in Danish) was to build Denmark’s highest wood construction which will also act as biocarbon bank. The primary building material is wood and for every m3 wood used one ton of CO2 is stored. TRÆ will be a sustainable office building. It will both contain healthy work environment and play an active role in the urban life of the area. The open ground floor is designed to invite by passers and the local community inside to contribute to the daily life of the buildings. Plants, green rooftops and a mini forest of adopted trees on ground level secures a healthy environment. The ambition is to attract users who put an emphasis on the communities and have business concepts, which can contribute to TRÆ. The large green roof scace will be the heart of the building and a centre for social encounter, as well as a kitchen garden for the canteen kitchen.

TRÆ consists of three buildings: T1 is a tower of 20 stories, T2 and T3 are 6 story buildings. The plan geometry is defined by three circles, which are cut off by the borders of the site. Thereby the buildings get rounded facades to the inside and flat facades to the streets. The buildings are connected by a pedestrian bridge from street level to the Kulkranbro. The buildings’ load bearing system consists of concrete cores, wooden CLT decks and wooden columns, thereby contributing to saving large amounts of CO2 emmisions.

But the concept is not limited to creating sustainable buildings. It is also about creating cities and buildings that are socially sustainable. By addressing issues relating to social inclusion, use of energy, resource efficiency, biodiversity, water use and health TRÆ aims to demonstrate how a holistic approach can provide solutions reaching far beyond its own sphere.

‘If we can do things differently, we can help accelerate a movement. This is what we are trying to accomplish with this project. We are all in. We truly believe there is a demand for this type of building from businesses. This type of building and living sustainably will become a part of their DNA. ‘

Michael Bruhn

Director, PFA Real Estate

‘The purpose of this collaboration is to gain knowledge and know-how about sustainable solutions. In this way we will be part of accelerating the transition of climate change mitigation of the building industry in Aarhus.’

Bente Lykke Sørensen

City Strategic Chief, Aarhus Municipality

‘The district south of Aarhus is a vibrant urban development area where we are trying to advance the scenery of entrepreneurs, artists and socially vulnerable citizens. This is why an ambitious project like TRÆ fits perfect into this area.’

Bente Lykke Sørensen

City Strategic Chief, Aarhus Municipality

  • TR3_opstalt
  • TR3_plan


Aarhus, Denmark


PFA Ejendomme