Re-inventing Construction: Proceedings of the Holcim Forum for Sustainable Construction 2010

432 to something beneficial for the whole, are a means to an end. This allows us to make good architecture and provide affordable apartments in a central city loca- tion. One could also see it as taxation of a different kind. In the final analysis, the entity that provides the money also profits. Despite rising land prices we will still be able to achieve a price differential between building developer and build- ing client association for quite some time. But to do this we will regularly have to come up with something new. One way to do this is to investigate areas other than highly desirable boroughs like Prenzlauer Berg. This is not always easy. At the moment, we are designing a project on Adalbertstrasse in Berlin-Kreuzberg. The interested persons who contacted us for the commission think the building we have designed is fantastic, but do not want to live in this marginally gentrified part of Berlin. In ten years time the situation will be different. The value of the residential area between the Spree and the Engelbecken will change completely for the better. A project like this has to be advertized in an entirely different way. Previously we merely publicized our projects on an Internet real estate portal and it was enough to attract interested people; for the Adalbertstrasse project we have engaged the services of a professional real-estate agent. Naturally, building developers on the lookout for new possibilities for generat- ing profit also continually come up with new ways of doing things. Paradoxically, they are also adopting the building group model. The building projects appear to be building group projects, but because of the involvement of the developer, there is an imperative for the generation of a profit margin, and any cost savings and other benefits are therefore not present. Our theory is that housing concepts be- come more diverse and experimental through the building group model and after being subjected to five years of scrutiny, this has been happily confirmed. Interview and text documentation: Julia von Mende About the authors: Christian Roth is co-principal of Zanderroth, a Berlin-based architecture firm. He studied at the RWTH Aachen, the Academy of Arts Dusseldorf, and the E.T.S.A. Madrid. He has a Diploma in Architecture from the RWTH Aachen. Sascha Zander is co-principal of Zanderroth, a Berlin-based architecture firm. He studied at the RWTH Aachen, the Academy of Arts Dusseldorf, and the Bartlett School of Architecture at Univer- sity College London. He has a Diploma in Architecture from the Bartlett School of Architecture at University College London and a Diploma in Urban Design from the RWTH Aachen. Sascha Zander And Christian Roth

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