This small tower designed by Dominique Coulon & Associés has been built in the historic Krutenau district in Strasbourg. The city has a number of “hollow teeth” – vacant plots that are too small to be of interest to promoters. In exchange for an attractive price, the consultation called for the production of an exemplary building guaranteeing the achievement of high energy performances, the use of bio-sourced materials, and a mixed-purpose project.

On a plot measuring just 120 sqm, French studio proposed a programme of offices and accommodation, with a kitchen garden and an organic swimming pool on the topmost terrace. The scorched wood facade masks the interconnection of the programmes. The openings in the walls appear to be random, not corresponding to any functional requirements, and their different sizes make it difficult to distinguish the different levels of the building.

Like Loos’ Raumplan, the spaces interconnect in a complex fashion, with double heights lending fluidity to the whole. The spacing between the different floors differs according to the spaces, giving them their proper proportions. On the inside, the materials used are sturdy and rustic. The concrete floors have merely been polished. Shelving and cupboards are in wood; the staircase is in untreated metal.