Interpolis Headquarters

During our undergraduate studies, we worked on a design of Rietveld Architects. Starting point of the assignment is the preliminary design of this 100 meters tall skyscraper. We redesigned several parts of the building. Also we added some features like stairs and balconies in the atrium.

The skyscraper is a collection of white blocks (office space) which are attached to a large red core. There are six white blocks, which are all used as office space. The areas in-between the blocks are used as ‘communication areas’. The different functions (office and communication) are expressed by the facade. The skyscraper is located in the Dutch city Tilburg.


The future skyscraper of Interpolis is located next to an existing Interpolis building which was designed by the Friesian architect Abe Bonnema. The orientation and hierarchy of the environment and current footprint is very strong. Rietveld Architects adhered to the stipulated principal urban ingredients regarding the twofer location, prominence of public space, and strong axis of entry. Phase 3 of the Interpolis Headquarters is building the tower.

The comprehensive and straightforward urban study was prepared by Architecten Cie.

Dialogue and monologue spaces

The design proposes an architectural distinction between the “monoloque” floors or single height work areas where screening off direct sunlight is paramount and the open and transparant “dialogue” floors or double height meeting areas. Therefore the facade structure changes in architectural expression and flows effortlessly from the one to the other office floor grouping. In the design the dialogue space is defined as a common area that is more open than standard work floors (these spaces have a green character). The monologue space is defined as a much more standard office work floor where you are by yourself or interact with you direct co-workers.


The structure articulated in the facade of the design provides a part of the building stability. This approach is usually referred to as an outrigger structure. The advantage of using this approach is that the outrigger diagonals do not disturb the view out of the office areas.


The facade structure changes in an architectural expression and flows effortlessly from the one to the other office floor grouping. Two different characters of facade are proposed in the design of Rietveld Architects. The dialogue and monologue areas. Each type expresses the different function behind the facade.


The floor plan (footprint) of the design is trapezoid shaped. Interestingly, the proposed footprint compares very favourably with the bayonet shaped floor plan of the Architecten Cie urban study. Even with the double high dialogue spaces and their vertical open connection, the floor area of the new Interpolis tower will be 24,500 square meters in the same 26 floors as stipulated in the urban study.

Interpolis Headquarters in 1:10m


Rietveld Architects suggested a red color for the core of the building. The ‘construction-net’ (facade) of the Interpolis tower is mainly coloured in white. These colours are often used by Rietveld Architects when looking to their portfolio. I thought it would be interesting to do some research about colours in Architecture. I was really surprised to find (hardly) nothing at all. There are no ‘rules’ for an architect of colouring his building…it’s only about the ‘taste’ of the client and the architect. That’s strange when you look to the psychology of colours. For e.g. does red means love or danger?
My girlfriend is a psychologist and could provide me with such researches. I took the best parts of the studies and implemented this in the Interpolis Building. I must say, the result doesn’t look bad at all!

*Please contact me if you’re interested in this research.

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