Kossmanndejong has designed the Straat van Bouwkunde [Engineering Street] in the central part of the building. Public services, such as the bookshop, service point, repro and plotting services and student union Atylos, and the E-point can be found along this street. A long wall with wooden cupboards connects the corridor area with the rooms behind it, turning it into a coherent unit.

The old boiler room has been refurbished into a café / restaurant, named Het Ketelhuis [The Boiler Room]. The scars and traces of the refurbishment have on purpose been left visible. The restaurant’s walls carry a statement in stencil letters by Bakema about design. Elements from these letters have also been used in Het Ketelhuis’s logo. The spaces around the restaurant each have their own character.

A fire destroyed the building of the Engineering department at the Technical University Delft in 2008. The department’s famous collection of chairs has been homeless ever since. From Tuesday 5 October the historically significant collection has finally been given a place of honour again in the departments building on Julianalaan 134 in Delft. Kosmann.dejong have designed a new display for the collection that consists of some 300 chairs, including ones by Gerrit Rietveld, Marcel Wanders and Chris Kabel. The collection is presented on a large stand, allowing the chairs to be admired from different angles.