Astro Tower – the first passive office building in Brussels

Major renovation of former Fortis building

Standing at a height of 107 metres and boasting 33 floors, Astro Tower is the first passive office block in Brussels and the city’s fifth tallest building. In partnership with Willemen General Contractor, we were responsible for the major renovation of this 1970s building.
Astro Tower
Astro Tower

Project properties

Project name
Major renovation of former Fortis building
Avenue de l’Astronomie, Brussel
Luri 1 s.a & Luri 2 s.a
Altiplan Architects

Stripped down to the bones

Owned by Fortis until 2005, Astro Tower is located on the Kleine Ring in Sint-Joost-ten-Node. The building was stripped down to its bare bones and rebuilt with completely new façades. Astro Tower has approximately 35,000 m² of office space, which has been laid out entirely according to the tenant’s wishes. The top three floors house the technical systems and there is a five-level underground car park.


Several parties were involved in this extensive project, including THV ASTRO, the construction consortium of Cordeel and Willemen General Contractor. Together, we carried out the demolition and structural alterations and installed a new steel structure on the roof. The brand new façade, which also serves as an insulating shell around the building, is the work of Belgo Metal CW. CES Engineering installed the highly energy-efficient heating and cooling systems.

Related projects