“We are pleased to provide a very positive reference for si_architecture + urban design and recommend their services. They provide professional, confident leadership from the initial design through construction, and I believe the exceptional architectural and urban design, their responsive and diligent commitment to client satisfaction, and the professional attitude and integrity are the main reasons why clients chose to work with them.”

“What an amazing journey it has been over a period of ten years! The architects were involved in the creation of the new city centre for the formerly divided city of Berlin, from the first vision to the final opening of the new Potsdamer Platz district. They are urban strategists with a real passion, and their practice is an urban strategy powerhouse that always inspired and met our very high expectations.”

“Their unique selling point is being able to think outside the box when assessing a complex design challenge. Steffen was key to the design and delivery of our new headquarters in the centre of Berlin, a building with high-performance workplaces for 500 people at the Association of German Banks. The architects developed a genuine rapport with the BdB as their client, and we trusted them to do the right thing. Their direct approach is refreshing and Steffen puts himself in his client’s shoes, which is always of great benefit. They designed and executed our new collaborative headquarters in Berlin that our employees, members and clients enthusiastically love being in.”

“The architects were very helpful and reliable, providing us with critical insight into our construction project and provided innovative solutions. We appreciated their down-to-earth attitude and ability to explain complex things clearly. Despite the very challenging budget situation, they managed the project as Generalplaner and created a beautiful new embassy and residence at Pariser Platz, in the heart of the city.”

“We have been working with Steffen on urbanisation, sustainable development and environmental design issues for several years. He has been a member of our advisory group and his critical knowledge on future cities and research in sustainable urbanism always attracts keen interest and attention. We highly appreciate his tireless and constant contributions to the vision of Adelaide’s more sustainable future. As a city, it is important for us to have new approaches and access to cutting-edge research and knowledge that supports our daily work.”

“As curator and artistic director of the Laneways projects, which involved twenty collaborating teams of artists and architects to design and built temporary installations in the urban public space of Sydney’s city centre, Steffen managed the entire project. It was a huge success, and one of the works became a permanent installation. We had always the confidence that everything has been dealt with, and overall it was a good collaboration alongside out team.”

“It was a great pleasure working with Steffen and Igor – their diligence, hard work, and understanding throughout the process was greatly appreciated and made our work easier than it might otherwise have been. They are easy to work with and at the same time laser-focused. We look forward to working together again. Thank you very much for the amazing collaboration! The consortium is very pleased with everything produced and we hope we can continue to develop new interesting synergies and projects in the future.”

“Over the last ten years, Steffen has shown outstanding leadership in advising our organisation and the City of Helsinki and the Helsinki Metropolitan Region concerning future urban development. He has an international and well-established reputation as leader in Green Urbanism and we have invited him several times to contribute to our urban strategies and hold seminars. His work and visits to Helsinki have not only made a significant contribution to the field of sustainable urban development, but has shaped and continues to shape our thinking about the future of our metropolitan region.”

“Steffen and Igor have more than 30 years of leadership experience in practice and a distinguished and widely recognized 20-year career in academia. I am impressed with their enthusiasm and passion for architecture, their many accomplishments, and their unparalleled international experience.”