In 2012, Tour & Taxis started the construction of a new passive office building on its site. The tenant of this building is Brussels Environment. The project was realised in 2014 and later that year Brussels Environment took up residence.
The building disposes of a BREEAM certificate with an "Excellent" level. BREEAM is the gold standard in terms of sustainable construction and has become the method of valuation used to describe the de facto environmental performance of a building.
The Brussels Environment building is one of the first construction in Belgium which can boast a high score in terms of sustainability.