Even with the wealth of architecture to see in Berlin, it's good to get out of the city and visit a small town in former East Germany that was so influential in development of craft, art and design.
Dessau was the home of the Bauhaus from 1926 to 1932, with such 'masters' as Kandinsky and Klee, and designers like Josef & Anni Albers. There are numerous groundbreaking white concrete-faced buildings around town, but the highlight is Gropius' Bauhaus building, with its stylish balconies and wealth of workshops inside.
From Berlin, trains are only 90 minutes from Hauptbahnhof, costing around £35 return. Once in Dessau, all of the buildings are free to visit, and there are frequent guided tours in English and German.
You will get to see the Masters' Houses decorated just as when they lived in them, and a short tram ride away is an entire estate of 1930s workers housing, some of which you can visit or even stay in!
www.dessau-rosslau-tourismus.de/kulttour/en/home/index.html
Google map: bit.ly/Sp9oLu
Is this your business?